Change can now also set value

[Wikunia]

PR Checklist

If you are contributing to Javis.jl, please make sure you are able to check off each item on this list:

• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
• Did I make sure to only change the part of the file where I introduced a new change/feature?
• Did I cover all corner cases to be close to 100% test coverage (if applicable)?
• Did I properly add Javis dependencies to the Project.toml + set an upper bound of the dependency (if applicable)?
• Did I properly add test dependencies to the test directory (if applicable)?
• Did I check relevant tutorials that may be affected by changes in this PR?
• Did I clearly articulate why this PR was made the way it was and how it was made?

Link to relevant issue(s)
Closes #279

How did you address these issues with this PR? What methods did you use?
I've added a change method which accepts everything but pairs and just set the keyword specified to that value. I additionally found a bug that appeared with ; keep=false as this didn't work for change. It now resets the dictionary every time such that it works now.

[codecov]

Codecov Report

Merging #295 (ef063bb) into master (e393802) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   95.92%   95.93%   +0.01%     
==========================================
  Files          21       21              
  Lines        1005     1008       +3     
==========================================
+ Hits          964      967       +3     
  Misses         41       41              

Impacted Files	Coverage Δ
src/Javis.jl	97.39% <100.00%> (+0.02%)	⬆️
src/action_animations.jl	100.00% <100.00%> (ø)

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[TheCedarPrince]

LGTM 😃