Move coverage reporter options to .nycrc.json

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
         run: npm run lint
 
       - name: Test
-        run: npm test -- --coverage-report=text --coverage-report=json
+        run: npm test
 
       - name: Coverage
         uses: codecov/codecov-action@v1

.nycrc.json

@@ -0,0 +1,3 @@
+{
+  "reporter": ["text", "lcov"]
+}