Use different version if Revise is tracking proto

[Tortar]

Alternative to #35. Look at https://discourse.julialang.org/t/is-there-a-way-to-know-if-revise-is-enabled/110379/6 for the limitations. Thanks to @Eben60 for the most part of the implementation (need to add him as a coauthor at least). It works fine on my machine

Fixes #13
Closes #35

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (df875e2) 97.50% compared to head (5bd48de) 91.72%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/ProtoStruct.jl	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #36      +/-   ##
==========================================
- Coverage   97.50%   91.72%   -5.78%     
==========================================
  Files           2        2              
  Lines         120      133      +13     
==========================================
+ Hits          117      122       +5     
- Misses          3       11       +8     

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[Tortar]

I think this one can be merged @BeastyBlacksmith without problems because it doesn't change the interface

[BeastyBlacksmith]

I am not a big fan of wrapping structs in modules for this. In theory this should't be necessary with this approach.
On the other hand I don't use Revise, so I trust you here.