Amplify Add API hanging

[wizage]

Describe the bug
When adding an API for Graphql and you edit your model using VSCode it will hang until you close the VSCode window.

To Reproduce
Steps to reproduce the behavior:

1. Default editor is set to VSCode
2. Set up an API and when you get to editing your model it will open VSCode
3. Change your model and then save the file
4. Hit enter in the terminal and it will go through and create the backend folder.
5. Observe the backend folder is created but it won't end the command until VSCode is closed.

Expected behavior
The API command will exit when you hit enter to continue.

Desktop (please complete the following information):

• OS: Mac

[kaustavghosh06]

@wizage I wasn't able to reproduce the issue with the version of my VSCode. Which version of VSCode are you using and does this happen repeatedly?

[wizage]

We are able to reproduce the error following these steps on VSCode 1.29.0 on Mac:

Make sure that VSCode is closed (not running):

1. amplify init -> select VSCode
2. amplify create api
3. Do you want to edit the schema now? -> yes
4. Edit file and then save it but do not close VSCode
5. Hit Enter to continue on the CLI and observe it hang.

[jerekapyaho]

I just ran into this error on Visual Studio Code 1.32.3 running on macOS 10.14.3, with Amplify CLI 1.1.8 (npm 6.9.0, node v11.12.0). The amplify add api command terminates only after you close the Visual Studio Code window used to edit the GraphQL schema.

[github-actions]

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