Bump rake from 12.3.0 to 12.3.2 (#9)

Author: dependabot[bot]

Gemfile.lock

@@ -68,7 +68,7 @@ GEM
     powerpack (0.1.1)
     rainbow (2.2.2)
       rake
-    rake (12.3.0)
+    rake (12.3.2)
     rspec (3.7.0)
       rspec-core (~> 3.7.0)
       rspec-expectations (~> 3.7.0)