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

@@ -49,7 +49,7 @@
     "test:browser": "karma start --single-run",
     "test:typescript": "tsc --noEmit test/specs/typescript.spec.ts",
     "coverage": "npm run coverage:node && npm run coverage:browser",
-    "coverage:node": "nyc --reporter=text --reporter=lcov node_modules/mocha/bin/mocha",
+    "coverage:node": "nyc node_modules/mocha/bin/mocha",
     "coverage:browser": "npm run test:browser -- --coverage",
     "upgrade": "npm-check -u && npm audit fix",
     "bump": "bump --tag --push --all",