chore(package): update dependencies

http://greenkeeper.io/

package.json

@@ -13,29 +13,29 @@
     "json5": "0.4.0"
   },
   "devDependencies": {
-    "babel": "5.8.21",
+    "babel": "6.3.26",
     "babel-core": "^6.3.17",
-    "babel-eslint": "4.1.0",
+    "babel-eslint": "5.0.0-beta6",
     "chai": "^3.4.1",
     "coveralls": "2.11.6",
-    "eslint": "1.2.1",
+    "eslint": "1.10.3",
     "gulp": "3.9.0",
-    "gulp-babel": "5.3.0",
+    "gulp-babel": "6.1.1",
     "gulp-bump": "1.0.0",
-    "gulp-eslint": "1.0.0",
+    "gulp-eslint": "1.1.1",
     "gulp-filter": "3.0.1",
-    "gulp-git": "1.6.0",
+    "gulp-git": "1.6.1",
     "gulp-if": "2.0.0",
     "gulp-prompt": "0.1.2",
-    "gulp-shell": "0.5.0",
+    "gulp-shell": "0.5.1",
     "gulp-tag-version": "1.3.0",
     "i18next": "^2.0.4",
     "istanbul": "0.4.1",
-    "mocha": "2.2.5",
+    "mocha": "2.3.4",
     "mockery": "^1.4.0",
-    "sinon": "1.17.1",
-    "watchify": "3.3.1",
-    "yargs": "3.29.0"
+    "sinon": "1.17.2",
+    "watchify": "3.6.1",
+    "yargs": "3.31.0"
   },
   "scripts": {
     "test": "mocha"