chore(package): update ava to version 1.2.1

Closes #15

Author: greenkeeper[bot]

package.json

@@ -7,7 +7,7 @@
   "author": "Oliver Nordbjerg <hi@notbjerg.me>",
   "license": "MIT",
   "devDependencies": {
-    "ava": "^0.21.0",
+    "ava": "^1.2.1",
     "babel-cli": "^6.23.0",
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.23.0",