jest flag for coverage

Author: ppiyush13

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "build": "rimraf dist && rollup --config",
     "release": "npm run build && np --no-yarn --no-cleanup --no-2fa",
-    "test": "jest"
+    "test": "jest --coverage --runInBand"
   },
   "author": {
     "name": "Piyush Lodaya",