chore(package): update regenerator-runtime to version 0.13.1

Closes #43

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "react": "^16.2.0",
     "react-dom": "^16.3.2",
     "react-test-renderer": "^16.3.2",
-    "regenerator-runtime": "^0.12.1",
+    "regenerator-runtime": "^0.13.1",
     "rollup": "^0.67.0",
     "rollup-plugin-babel": "^4.0.3",
     "rollup-plugin-commonjs": "^9.0.0",