fix(package): update execa to version 2.0.1

Closes #48

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "index.js"
   ],
   "dependencies": {
-    "execa": "^1.0.0",
+    "execa": "^2.0.1",
     "globby": "^8.0.1",
     "p-map": "^2.0.0",
     "rimraf": "^2.6.2"