Trying to fix travis build

Author: sharkdp

.travis.yml

@@ -9,6 +9,7 @@ install:
   - wget -O $HOME/purescript.tar.gz https://github.com/purescript/purescript/releases/download/$TAG/linux64.tar.gz
   - tar -xvf $HOME/purescript.tar.gz -C $HOME/
   - chmod a+x $HOME/purescript
+  - npm install bower
   - npm install
 script:
   - npm run build

package.json

@@ -7,7 +7,7 @@
     "big-integer": "^1.6.9"
   },
   "devDependencies": {
-    "pulp": "^4.0.2",
+    "pulp": "^6.2.0",
     "rimraf": "^2.4.1"
   }
 }