fix(ports): bump portscanner -> 2.1.1 to fix issues with string types

fixes #1254
closes #1256

Author: shakyShane

package.json

@@ -47,7 +47,7 @@
     "localtunnel": "1.8.2",
     "micromatch": "2.3.11",
     "opn": "4.0.2",
-    "portscanner": "^1.0.0",
+    "portscanner": "2.1.1",
     "qs": "6.2.1",
     "resp-modifier": "6.0.2",
     "rx": "4.1.0",