Simplified the "coverage" script by adding a .nycrc file

Author: JamesMessinger

.nycrc.yml

@@ -0,0 +1,10 @@
+# NYC config
+# https://github.com/istanbuljs/nyc#configuration-files
+
+extension:
+  - .js
+  - .ts
+
+reporter:
+  - text
+  - lcov

package.json

@@ -39,7 +39,7 @@
     "build": "tsc",
     "watch": "tsc --watch",
     "test": "mocha && npm run lint",
-    "coverage": "nyc --reporter=text --reporter=lcov node_modules/mocha/bin/mocha",
+    "coverage": "nyc node_modules/mocha/bin/mocha",
     "upgrade": "npm-check -u && npm audit fix",
     "bump": "bump --tag --push --all",
     "release": "npm run upgrade && npm run clean && npm run build && npm test && npm run bump"