fix(package): update execa to version 2.0.2

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "aggregate-error": "^3.0.0",
     "debug": "^4.0.0",
     "dir-glob": "^3.0.0",
-    "execa": "^1.0.0",
+    "execa": "^2.0.2",
     "fs-extra": "^8.0.0",
     "globby": "^10.0.0",
     "lodash": "^4.17.4",