chore(package): update diff to version 3.4.0

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "conventional-changelog-cli": "1.3.4",
     "coveralls": "^3.0.0",
     "cz-conventional-changelog": "2.0.0",
-    "diff": "3.3.1",
+    "diff": "3.4.0",
     "nyc": "11.2.1",
     "react": "^16.0.0",
     "rimraf": "2.6.2",