chore: Strictly require a version of babylon with semicolon bug fix

Fixes #795

Author: tmcw

package.json

@@ -18,7 +18,7 @@
     "babel-traverse": "^6.16.0",
     "babel-types": "^6.16.0",
     "babelify": "^7.3.0",
-    "babylon": "^6.11.4",
+    "babylon": "^6.17.2",
     "chalk": "^1.1.1",
     "chokidar": "^1.2.0",
     "concat-stream": "^1.5.0",

yarn.lock

@@ -978,7 +978,7 @@ babelify@^7.3.0:
     babel-core "^6.0.14"
     object-assign "^4.0.0"
 
-babylon@^6.11.0, babylon@^6.11.4, babylon@^6.13.0, babylon@^6.15.0, babylon@^6.17.0:
+babylon@^6.11.0, babylon@^6.13.0, babylon@^6.15.0, babylon@^6.17.0, babylon@^6.17.2:
   version "6.17.2"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.17.2.tgz#201d25ef5f892c41bae49488b08db0dd476e9f5c"