WIP: Implement fixup function

[nickrobinson251]

• WIP on Add support for updating package to comply with a Template #16
• Not sure if/when i'll get time to finish this PR -- would love for someone to take over this!

[codecov]

Codecov Report

Merging #288 (03edd60) into master (2ce6808) will decrease coverage by 3.42%.
The diff coverage is 4.16%.

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
- Coverage   94.40%   90.98%   -3.43%     
==========================================
  Files          20       21       +1     
  Lines         608      632      +24     
==========================================
+ Hits          574      575       +1     
- Misses         34       57      +23     

Impacted Files	Coverage Δ
src/PkgTemplates.jl	87.50% <0.00%> (-12.50%)	⬇️
src/fixup.jl	0.00% <0.00%> (ø)
src/plugin.jl	96.82% <0.00%> (-1.57%)	⬇️
src/plugins/documenter.jl	82.85% <0.00%> (-1.21%)	⬇️
src/plugins/git.jl	87.50% <0.00%> (-7.42%)	⬇️
src/plugins/license.jl	82.60% <0.00%> (-7.87%)	⬇️
src/plugins/src_dir.jl	90.00% <0.00%> (-10.00%)	⬇️
src/plugins/project_file.jl	75.00% <33.33%> (-13.89%)	⬇️

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