Remove yarn.lock to not lock ourselves in dependencies with security issues (#14)

Author: yakhinvadim

package.json

@@ -15,6 +15,9 @@
     "prepare": "npm run build",
     "precommit": "lint-staged"
   },
+  "jest": {
+    "testURL": "http://localhost/"
+  },
   "lint-staged": {
     "*.js": [
       "eslint --fix",
@@ -30,7 +33,7 @@
     "url": "git+https://github.com/elastic/app-search-javascript.git"
   },
   "author": "Elastic",
-   "license": "Apache 2.0",
+  "license": "Apache 2.0",
   "bugs": {
     "url": "https://github.com/elastic/app-search-javascript/issues"
   },