Set minimum version for mime package

Related to https://nvd.nist.gov/vuln/detail/CVE-2017-16138

Author: thgh

package.json

@@ -33,7 +33,7 @@
     "dist"
   ],
   "dependencies": {
-    "mime": "2",
+    "mime": ">=2.0.3",
     "opener": "1"
   },
   "devDependencies": {