Better checks for Changelog entries

[neelasha23]

Closes #76

[neelasha23]

Please review @edublancas

[edublancas]

@bryannho please dome some testing

you can open a dummy PR in this repo to test it: https://github.com/ploomber/dummy

just ensure you're installing pkgmt from the right place

pip install https://github.com/neelasha23/pkgmt@issue76

if you have questions about installation and testing let us know

[bryannho]

@edublancas @neelasha23 Did some testing, you can see my tests here: https://github.com/ploomber/dummy/pull/64

Tested these cases:

• PASS: if the changelog in the PR modifies the contents of the 0.10.0dev section
• FAIL: if there are changes in a section other than 0.10.0dev
• FAIL: if there is no 0.10.0dev section
• FAIL: if the 0.10.0dev has changed but the changes are only whitespace
• FAIL: if a previous section is removed
• FAIL: the 10.0.0dev section is replaced by 10.0.0 (removing the dev)
• FAIL: if a previous entry in the 0.10.0dev section is removed

All cases work as expected except for the main one: If Changelog.md is not modified at all, but another file is, the test passes when it should fail. Meaning this catch isn't working for some reason. See this commit and the CI check. You can also look at the files changed to see I didn't modify the changelog. LMK if I'm testing incorrectly but I'm pretty sure this is an error since the other cases behaved as expected.

Another note is I had to modify ci.yml here, so to make these changes work in other repos we'll have to make the same change in each one.

[neelasha23]

Fixed the bug that @bryannho mentioned. here's the commit and the check

Please review again

@bryannho @edublancas

[edublancas]

@bryannho don't forget to perform reviews, remember that we have a 24 hours SLA