Make test coverage to be optional.

Author: trekhleb

jest.config.js

@@ -1,5 +1,5 @@
 module.exports = {
   verbose: false,
-  collectCoverage: true,
+  collectCoverage: false,
   coverageDirectory: './coverage/',
 };

package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "lint": "eslint ./src/*",
     "test": "jest",
-    "ci": "npm run lint && npm run test",
+    "ci": "npm run lint && npm run test -- --coverage",
     "codecov": "codecov"
   },
   "repository": {