Bump sprockets from 3.7.0 to 4.0.2

Bumps [sprockets](https://github.com/rails/sprockets) from 3.7.0 to 4.0.2.
- [Release notes](https://github.com/rails/sprockets/releases)
- [Changelog](https://github.com/rails/sprockets/blob/master/CHANGELOG.md)
- [Commits](rails/sprockets@v3.7.0...v4.0.2)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -1,123 +1,123 @@
-GEM
-  remote: https://rubygems.org/
-  specs:
-    activesupport (4.2.7.1)
-      i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    addressable (2.4.0)
-    autoprefixer-rails (6.4.1)
-      execjs
-    backports (3.6.8)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.10.0)
-    compass-import-once (1.0.5)
-      sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.2)
-    contracts (0.13.0)
-    dotenv (2.1.1)
-    erubis (2.7.0)
-    execjs (2.7.0)
-    fast_blank (1.0.0)
-    fastimage (2.0.0)
-      addressable (~> 2)
-    ffi (1.9.14)
-    ffi (1.9.14-x64-mingw32)
-    haml (4.0.7)
-      tilt
-    hamster (3.0.0)
-      concurrent-ruby (~> 1.0)
-    hashie (3.4.4)
-    i18n (0.7.0)
-    json (1.8.6)
-    kramdown (1.12.0)
-    listen (3.0.8)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    memoist (0.15.0)
-    middleman (4.1.10)
-      coffee-script (~> 2.2)
-      compass-import-once (= 1.0.5)
-      haml (>= 4.0.5)
-      kramdown (~> 1.2)
-      middleman-cli (= 4.1.10)
-      middleman-core (= 4.1.10)
-      sass (>= 3.4.0, < 4.0)
-    middleman-autoprefixer (2.7.0)
-      autoprefixer-rails (>= 6.3.1, < 7.0.0)
-      middleman-core (>= 3.3.3)
-    middleman-cli (4.1.10)
-      thor (>= 0.17.0, < 2.0)
-    middleman-core (4.1.10)
-      activesupport (~> 4.2)
-      addressable (~> 2.3)
-      backports (~> 3.6)
-      bundler (~> 1.1)
-      contracts (~> 0.13.0)
-      dotenv
-      erubis
-      execjs (~> 2.0)
-      fast_blank
-      fastimage (~> 2.0)
-      hamster (~> 3.0)
-      hashie (~> 3.4)
-      i18n (~> 0.7.0)
-      listen (~> 3.0.0)
-      memoist (~> 0.14)
-      padrino-helpers (~> 0.13.0)
-      parallel
-      rack (>= 1.4.5, < 2.0)
-      sass (>= 3.4)
-      servolux
-      tilt (~> 1.4.1)
-      uglifier (~> 3.0)
-    middleman-sprockets (4.0.0)
-      middleman-core (~> 4.0)
-      sprockets (>= 3.0)
-    middleman-syntax (3.0.0)
-      middleman-core (>= 3.2)
-      rouge (~> 2.0)
-    minitest (5.9.0)
-    padrino-helpers (0.13.3.1)
-      i18n (~> 0.6, >= 0.6.7)
-      padrino-support (= 0.13.3.1)
-      tilt (>= 1.4.1, < 3)
-    padrino-support (0.13.3.1)
-      activesupport (>= 3.1)
-    parallel (1.9.0)
-    rack (1.6.4)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.7)
-      ffi (>= 0.5.0)
-    redcarpet (3.3.4)
-    rouge (2.0.5)
-    sass (3.4.22)
-    servolux (0.12.0)
-    sprockets (3.7.0)
-      concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
-    thor (0.19.1)
-    thread_safe (0.3.5)
-    tilt (1.4.1)
-    tzinfo (1.2.2)
-      thread_safe (~> 0.1)
-    uglifier (3.0.2)
-      execjs (>= 0.3.0, < 3)
-
-PLATFORMS
-  ruby
-  x64-mingw32
-
-DEPENDENCIES
-  middleman (~> 4.1.0)
-  middleman-autoprefixer (~> 2.7.0)
-  middleman-sprockets (~> 4.0.0)
-  middleman-syntax (~> 3.0.0)
-  redcarpet (~> 3.3.2)
+GEM
+  remote: https://rubygems.org/
+  specs:
+    activesupport (4.2.7.1)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    addressable (2.4.0)
+    autoprefixer-rails (6.4.1)
+      execjs
+    backports (3.6.8)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.10.0)
+    compass-import-once (1.0.5)
+      sass (>= 3.2, < 3.5)
+    concurrent-ruby (1.1.9)
+    contracts (0.13.0)
+    dotenv (2.1.1)
+    erubis (2.7.0)
+    execjs (2.7.0)
+    fast_blank (1.0.0)
+    fastimage (2.0.0)
+      addressable (~> 2)
+    ffi (1.9.14)
+    ffi (1.9.14-x64-mingw32)
+    haml (4.0.7)
+      tilt
+    hamster (3.0.0)
+      concurrent-ruby (~> 1.0)
+    hashie (3.4.4)
+    i18n (0.7.0)
+    json (1.8.6)
+    kramdown (1.12.0)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    memoist (0.15.0)
+    middleman (4.1.10)
+      coffee-script (~> 2.2)
+      compass-import-once (= 1.0.5)
+      haml (>= 4.0.5)
+      kramdown (~> 1.2)
+      middleman-cli (= 4.1.10)
+      middleman-core (= 4.1.10)
+      sass (>= 3.4.0, < 4.0)
+    middleman-autoprefixer (2.7.0)
+      autoprefixer-rails (>= 6.3.1, < 7.0.0)
+      middleman-core (>= 3.3.3)
+    middleman-cli (4.1.10)
+      thor (>= 0.17.0, < 2.0)
+    middleman-core (4.1.10)
+      activesupport (~> 4.2)
+      addressable (~> 2.3)
+      backports (~> 3.6)
+      bundler (~> 1.1)
+      contracts (~> 0.13.0)
+      dotenv
+      erubis
+      execjs (~> 2.0)
+      fast_blank
+      fastimage (~> 2.0)
+      hamster (~> 3.0)
+      hashie (~> 3.4)
+      i18n (~> 0.7.0)
+      listen (~> 3.0.0)
+      memoist (~> 0.14)
+      padrino-helpers (~> 0.13.0)
+      parallel
+      rack (>= 1.4.5, < 2.0)
+      sass (>= 3.4)
+      servolux
+      tilt (~> 1.4.1)
+      uglifier (~> 3.0)
+    middleman-sprockets (4.0.0)
+      middleman-core (~> 4.0)
+      sprockets (>= 3.0)
+    middleman-syntax (3.0.0)
+      middleman-core (>= 3.2)
+      rouge (~> 2.0)
+    minitest (5.9.0)
+    padrino-helpers (0.13.3.1)
+      i18n (~> 0.6, >= 0.6.7)
+      padrino-support (= 0.13.3.1)
+      tilt (>= 1.4.1, < 3)
+    padrino-support (0.13.3.1)
+      activesupport (>= 3.1)
+    parallel (1.9.0)
+    rack (1.6.13)
+    rb-fsevent (0.9.7)
+    rb-inotify (0.9.7)
+      ffi (>= 0.5.0)
+    redcarpet (3.3.4)
+    rouge (2.0.5)
+    sass (3.4.22)
+    servolux (0.12.0)
+    sprockets (4.0.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    thor (0.19.1)
+    thread_safe (0.3.5)
+    tilt (1.4.1)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    uglifier (3.0.2)
+      execjs (>= 0.3.0, < 3)
+
+PLATFORMS
+  ruby
+  x64-mingw32
+
+DEPENDENCIES
+  middleman (~> 4.1.0)
+  middleman-autoprefixer (~> 2.7.0)
+  middleman-sprockets (~> 4.0.0)
+  middleman-syntax (~> 3.0.0)
+  redcarpet (~> 3.3.2)
   rouge (~> 2.0.5)
 
 BUNDLED WITH