Update PR template

[Andrew-S-Rosen]

What should we add?

The PR template has "I have updated the documentation, VERSION, and CHANGELOG accordingly" as a checkbox. However, the VERSION does not need to be updated since it will be done so automatically.

It also says:
⚠️ Increment the version number in the /VERSION file. If this is a bugfix, increment the patch version (the rightmost number), for example 0.18.2 becomes 0.18.3. If it's a new feature, increment the minor version (the middle number), for example 0.18.2 becomes 0.19.0.
⚠️ Add a note to /CHANGELOG.md with your version number and the date, summarizing the changes.

Both of these are not currently accurate since the user is not supposed to increment the version number manually or set the date.

The same should be done in the main covalent repo too I think...