[MRG] Update what's new

[jasmainak]

closes #260

It's WIP. Since it's a little repetitive task, I'll finish it when I'm at the library later today.

We should make sure to update it before merging a pull request from now on.

[codecov-io]

Codecov Report

Merging #262 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   72.97%   72.97%           
=======================================
  Files           4        4           
  Lines         618      618           
  Branches      125      125           
=======================================
  Hits          451      451           
- Misses        127      128    +1     
+ Partials       40       39    -1

Impacted Files	Coverage Δ
pyglmnet/pyglmnet.py	78.68% <0%> (ø)	:arrow_up:

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[jasmainak]

@pavanramkumar I'm done here. Let me know if I missed something. Or feel free to push directly to this branch.

[jasmainak]

@pavanramkumar it's funny how we didn't add many features but I'm quite happy about the improved test coverage and the refactoring. I think it's a good move in the long run and makes the library more robust.

[pavanramkumar]

@jasmainak

some more issues we solved, not sure where it belongs in the changelog:

• improved convergence testing
• gradient checks

[jasmainak]

@pavanramkumar the two contributions you mention are really important but I don't know if it belongs to this document. The whats_new.rst is more for users who need to know what to look for in the new version. We could still add it if you want, so as to acknowledge the contributions.

[jasmainak]

Other comments addressed btw

[pavanramkumar]

thanks! LGTM once those two contribs are added.

[jasmainak]

Great, added.