fix(build): add missing fs-extra dependency

Author: David Zukowski

package.json

@@ -67,6 +67,7 @@
     "eslint-plugin-standard": "^3.0.1",
     "extract-text-webpack-plugin": "^2.1.0",
     "figures": "^2.0.0",
+    "fs-extra": "^3.0.1",
     "html-webpack-plugin": "^2.24.1",
     "ip": "^1.1.5",
     "karma": "^1.7.0",

yarn.lock

@@ -2532,6 +2532,14 @@ fresh@0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/fresh/-/fresh-0.5.0.tgz#f474ca5e6a9246d6fd8e0953cfa9b9c805afa78e"
 
+fs-extra@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-3.0.1.tgz#3794f378c58b342ea7dbbb23095109c4b3b62291"
+  dependencies:
+    graceful-fs "^4.1.2"
+    jsonfile "^3.0.0"
+    universalify "^0.1.0"
+
 fs-extra@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-1.0.0.tgz#cd3ce5f7e7cb6145883fcae3191e9877f8587950"
@@ -3317,6 +3325,12 @@ jsonfile@^2.1.0:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
+jsonfile@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-3.0.0.tgz#92e7c7444e5ffd5fa32e6a9ae8b85034df8347d0"
+  optionalDependencies:
+    graceful-fs "^4.1.6"
+
 jsonify@~0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.0.tgz#2c74b6ee41d93ca51b7b5aaee8f503631d252a73"
@@ -5762,6 +5776,10 @@ uniqs@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/uniqs/-/uniqs-2.0.0.tgz#ffede4b36b25290696e6e165d4a59edb998e6b02"
 
+universalify@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/universalify/-/universalify-0.1.0.tgz#9eb1c4651debcc670cc94f1a75762332bb967778"
+
 unpipe@1.0.0, unpipe@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"