test: improve nyc usage by adding .nycrc

.nycrc

@@ -0,0 +1,20 @@
+{
+  "extension": [
+    ".ts"
+  ],
+  "require": [
+    "ts-node/register"
+  ],
+  "include": [
+    "lib/**/*.ts"
+  ],
+  "exclude": [
+    "**/*.d.ts"
+  ],
+  "reporter": [
+    "html",
+    "text-summary",
+    "lcov"
+  ],
+  "all": true
+}

package.json

@@ -46,7 +46,7 @@
     "prettier": "prettier --write",
     "prettier:all": "yarn prettier lib/**/*.ts tools/**/*.js scripts/**/*.js test/**/*.ts examples/**/*.js",
     "test": "mocha --require ts-node/register test/**/*.spec.ts --reporter spec --timeout 60000",
-    "test:coverage": "nyc --reporter=text-summary --reporter=lcov --reporter=html yarn test",
+    "test:coverage": "nyc yarn test",
     "test:electron": "electron-mocha --require ts-node/register test/**/*.spec.ts --reporter spec --timeout 60000",
     "test:watch": "yarn test --watch --watch-files lib/*.ts lib/**/*.ts test/**/*.spec.ts",
     "preversion": "yarn lint && yarn clean:dist && yarn build:dist"