Update md5-file requirement from ^3.2.3 to ^4.0.0 (#235)

Updates the requirements on [md5-file](https://github.com/roryrjb/md5-file) to permit the latest version.
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- See full diff in [compare view](https://github.com/roryrjb/md5-file/commits/v4.0.0)
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Author: dependabot[bot]

package.json

@@ -57,7 +57,7 @@
     "lodash.set": "^4.3.2",
     "lodash.uniqby": "^4.0.0",
     "lodash.values": "^4.3.0",
-    "md5-file": "^3.2.3",
+    "md5-file": "^4.0.0",
     "rimraf": "^2.6.2",
     "shell-quote": "^1.6.1"
   },