Update submodule "Draw.io" to fix Mathematical typesetting exporting issue

[Qatleph]

Issue #180 The version of Draw.io used in the project (v16.0.0) is causing this issue, so I updated submodule to v20.3.0. However, I have not checked the effect on other features, so be careful about that.

[hediet]

Thank you! Can you add a changelog entry like this: https://github.com/hediet/vscode-drawio/commit/ecd7fa4b951495cbfd7d3d94a8ddfde061d1e2fa

[Qatleph]

Adds some lines to Changelog

[MichaelHopwood]

Anything blocking this merge? This would fix a lot of my docs :)

[hediet]

Sorry, working on VS Code currently takes all my time...

[MichaelHopwood]

@keikouto2001 do you know how to use this latest version in VSCode? I'm seeing the latest official release was from last March. How do we use the latest repo from master?

[Qatleph]

@MichaelHopwood I prepared my environment by trial and error, so it may not be optimal.

First, make sure the following are installed:

• npm, yarn
• Git

I followed these steps:

• Clone the repository with the --recursive option (this step may take an hour or more)
• Run yarn install in the generated vscode-drawio folder
• Run yarn run build to build
• Select Install from VSIX in the VSCode Extensions menu and select vscode-drawio.vsix that you have just built (perhaps you should uninstall the old vscode-drawio)
• Check that it works correctly

*Beware of unexpected behavior as this is not an official release

[MichaelHopwood]

@keikouto2001 Thanks for your instructions. I was able to replicate it on my end and appears to be working as expected.