chore(package): update diff to version 3.3.1 (#1406)

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "babel-preset-es2015": "6.24.1",
     "babel-preset-es2015-rollup": "3.0.0",
     "codeclimate-test-reporter": "^0.5.0",
-    "diff": "3.3.0",
+    "diff": "3.3.1",
     "docdash": "0.4.0",
     "jasmine": "2.8.0",
     "js-yaml": "3.9.1",