chore: upgrade to eslint 5.15.3 (#75)

* chore(package): update eslint to version 5.15.3

* chore(package): update lockfile yarn.lock

Author: thymikee

package.json

@@ -30,7 +30,7 @@
     "@babel/preset-env": "^7.0.0",
     "@babel/preset-flow": "^7.0.0",
     "@babel/preset-react": "^7.0.0",
-    "eslint": "^5.0.0",
+    "eslint": "^5.15.3",
     "eslint-config-callstack-io": "^1.1.1",
     "flow-bin": "^0.95.1",
     "jest": "^24.0.0",