chore(package): update eslint to version 6.0.0

Closes #30

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
 		"@babel/preset-env": "^7.3.4",
 		"babel-eslint": "^8.2.3",
 		"chai": "^4.1.2",
-		"eslint": "^4.19.1",
+		"eslint": "^6.0.0",
 		"eslint-config-fullstack": "^5.0.0",
 		"eslint-config-prettier": "^2.9.0",
 		"eslint-plugin-react": "^7.7.0",