chore(package): update eslint to version 6.6.0

Closes #24

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
     "babel-eslint": "^10.0.1",
     "babel-jest": "^23.6.0",
     "commitlint": "^7.2.1",
-    "eslint": "^5.7.0",
+    "eslint": "^6.6.0",
     "eslint-config-prettier": "^3.1.0",
     "eslint-config-problems": "^2.0.0",
     "eslint-plugin-babel": "^5.2.1",