Edition should not start capitalize letter

[fabgio]

• Add EditionChecker feature to permit edition to begin with a number
• Add proper test
• Update CHANGELOG

[Siedlerchr]

Codewise this is fine so far, but you somehow have the wrong code style.
To avoid conflicts due to different code styles, we have created a custom code style for formatting.
See here for details:
https://github.com/JabRef/jabref/tree/master/config

[koppor]

Thank you for the contribution and welcome to JabRef 🎉

I have some "nitpick" comments. Some of them seem to be caused, because the steps we wrote at https://devdocs.jabref.org/getting-into-the-code/guidelines-for-setting-up-a-local-workspace#configure-your-ide were not fully followed. Can we do something to improve the howto?

[koppor]

Some more comments 😇

[calixtus]

Please do not remove the predefined RunConfiguration "JabRef_Main.xml".

[fabgio]

Did all my best!

[calixtus]

Hi @fabgio, great work so far. I still see some problems with checkstyle.
A simple trick: If you use IntelliJ with CheckStyle, you can simply select everything and push Ctrl+Alt+L and mosts or all identation and checkstyle errors should be gone.

[calixtus]

So beautiful. ;-) LGTM.

[fabgio]

I made all the improvments you suggest. i also semplified a nested if condition in EditionChecker class

[Siedlerchr]

Codewise looks good to me! You still have some checkstyle issues, please resolve them so we can merge Just use reformat code Ctrl+Alt+L in the file

[koppor]

Follow ups:

• 766862e
• Add simple Unit tests #6207

@fabgio Thank you for the PR. Looking forward to more contributions. In case you are more keen to write some helping text, you are invited to join our efforts on improving the documetnation: https://github.com/JabRef/user-documentation/issues