fix(package): update get-port to version 5.1.0

Closes #43

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "chokidar": "^2.0.3",
     "dotenv": "^6.0.0",
     "find-babel-config": "^1.1.0",
-    "get-port": "^4.0.0",
+    "get-port": "^5.1.0",
     "import-local-file": "^0.2.0",
     "lodash": "^4.17.11",
     "loud-rejection": "^1.6.0",