launch.json says "Property debugStdLib is not allowed."

[v-kydela]

Environment data

• VS Code version: 1.34.0
• Extension version (available under the Extensions sidebar): 2019.5.17517
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): 3.7
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: N/A

Expected behaviour

launch.json should not underline properties that are allowed and useful. 'debugStdLib' needs to be added to the schema for Python configurations.

Actual behaviour

Steps to reproduce:

1. Add "debugStdLib": true to a Python launch configuration
2. See warning

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Starting Microsoft Python language server.
Downloading https://pvsc.azureedge.net/python-language-server-stable/Python-Language-Server-win-x64.0.2.87.nupkg... complete
Unpacking archive... done
[Info  - 12:48:11 PM] GetCurrentSearchPaths C:\Users\v-kydela\AppData\Local\Programs\Python\Python37-32\python.exe 
[Info  - 12:48:11 PM] Python search paths:
[Info  - 12:48:11 PM]     c:\users\v-kydela\appdata\local\programs\python\python37-32\dlls
[Info  - 12:48:11 PM]     c:\users\v-kydela\appdata\local\programs\python\python37-32\lib
[Info  - 12:48:11 PM]     c:\users\v-kydela\appdata\local\programs\python\python37-32
[Info  - 12:48:11 PM]     c:\users\v-kydela\appdata\roaming\python\python37\site-packages
[Info  - 12:48:11 PM]     c:\users\v-kydela\appdata\local\programs\python\python37-32\lib\site-packages
[Info  - 12:48:11 PM] Configuration search paths:
[Info  - 12:48:12 PM] Microsoft Python Language Server version 0.2.87.0
[Info  - 12:48:12 PM] Initializing for C:\Users\v-kydela\AppData\Local\Programs\Python\Python37-32\python.exe

[DonJayamanne]

debugStdLib has been deprecated in favour of justMyCode. Please check here https://code.visualstudio.com/docs/python/debugging#_justmycode

If you reload VS Code with the above setting saved, then you'll get a prompt to use jsutMyCode instead.
Also, existing settings (launch.json files with the above setting) will get changed with the below prompt.

I.e. users with old launch.json files will have their settings updated via the prompt, and users using the new setting will see that its deprecated. We're hoping users will go to the documentation.