fix(ci): add lcov reporter to test:coverage

Author: jankapunkt

package.json

@@ -46,7 +46,7 @@
     "test": "NODE_ENV=test ./node_modules/.bin/mocha 'test/**/*_test.js'",
     "test-debug": "NODE_ENV=test ./node_modules/.bin/mocha  --inspect --debug-brk 'test/**/*_test.js'",
     "test:watch": "NODE_ENV=test ./node_modules/.bin/mocha --watch 'test/**/*_test.js'",
-    "test:coverage": "NODE_ENV=test nyc --reporter=html --reporter=text ./node_modules/.bin/mocha 'test/**/*_test.js'",
+    "test:coverage": "NODE_ENV=test nyc --reporter=html --reporter=lcov --reporter=text ./node_modules/.bin/mocha 'test/**/*_test.js'",
     "lint": "npx eslint .",
     "lint:fix": "npx eslint . --fix"
   },