fix(package): update diff to version 4.0.2

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "chalk": "3.0.0",
     "debug": "4.1.1",
     "del": "5.1.0",
-    "diff": "4.0.1",
+    "diff": "4.0.2",
     "escape-string-regexp": "2.0.0",
     "globby": "10.0.1",
     "mkdirp": "^0.5.1",