fix: upgrade standard, and fix appveyor config so that it works with …

…newest standard (#607)

* test: do both cmd and PowerShell fail

* fix: simplify appveyor configuration

appveyor.yml

@@ -20,13 +20,10 @@ test_script:
   # Output useful info for debugging.
   - node --version
   - npm --version
-  # We test multiple Windows shells
-  - ps: "npm t # PowerShell" # Pass comment to PS for easier debugging
   - cmd: npm t
 
 os:
   - Default Azure
-  - Windows Server 2012 R2
 
 # Don't actually build using MSBuild
 build: off

package.json

@@ -38,7 +38,7 @@
     "mocha": "^3.0.1",
     "nyc": "^8.1.0",
     "rimraf": "^2.5.0",
-    "standard": "^7.0.0",
+    "standard": "^8.0.0",
     "standard-version": "^2.2.1",
     "which": "^1.2.9"
   },