fix(extension): prompt default should be index not key (#935)

Author: ErisDS

lib/extension.js

@@ -65,7 +65,7 @@ class Extension {
                 type: 'expand',
                 name: 'choice',
                 message: `Would you like to view or edit the ${descriptor} file?`,
-                default: 'n',
+                default: 0,
                 choices: [
                     {key: 'n', name: 'No, continue', value: 'continue'},
                     {key: 'v', name: 'View the file', value: 'view'},