Update dependency micro-dev to v3.1.0

Author: renovate[bot]

package.json

@@ -33,7 +33,7 @@
     "ava": "2.4.0",
     "axios": "0.19.0",
     "coveralls": "3.0.5",
-    "micro-dev": "3.0.0",
+    "micro-dev": "3.1.0",
     "nyc": "14.1.1",
     "standard": "13.1.0",
     "test-listen": "1.1.0"