Added coveralls

Author: helderberto

package.json

@@ -10,7 +10,8 @@
     "lint": "eslint src tests",
     "test": "jest --coverage --expand",
     "test:watch": "jest --watch",
-    "prepublish": "yarn lint && yarn test && yarn clean && yarn build"
+    "prepublish": "yarn lint && yarn test && yarn clean && yarn build",
+    "coveralls": "cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
   "repository": {
     "type": "git",
@@ -29,6 +30,7 @@
     "@babel/preset-env": "^7.6.3",
     "babel-jest": "^24.9.0",
     "babel-loader": "^8.0.6",
+    "coveralls": "^3.0.7",
     "eslint": "^6.5.1",
     "eslint-config-airbnb-base": "^14.0.0",
     "eslint-config-prettier": "^6.4.0",