chore(package): update ava to version 2.1.0

Closes #122

Author: greenkeeper[bot]

package.json

@@ -40,7 +40,7 @@
     "@babel/preset-env": "^7.2.3",
     "@babel/preset-flow": "^7.0.0",
     "@babel/preset-react": "^7.0.0",
-    "ava": "^1.1.0",
+    "ava": "^2.1.0",
     "babel-eslint": "^10.0.1",
     "babel-plugin-istanbul": "^5.1.0",
     "chalk": "^2.4.2",