new version mechanism

[mike0sv]

closes #66

[codecov]

Codecov Report

Merging #190 (f514ca4) into main (9134690) will decrease coverage by 1.71%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main     #190      +/-   ##
==========================================
- Coverage   89.12%   87.40%   -1.72%     
==========================================
  Files          70       70              
  Lines        4660     4635      -25     
==========================================
- Hits         4153     4051     -102     
- Misses        507      584      +77     

Impacted Files	Coverage Δ
mlem/version.py	36.36% <40.00%> (-35.86%)	⬇️
mlem/contrib/docker/helpers.py	50.00% <0.00%> (-50.00%)	⬇️
mlem/contrib/heroku/utils.py	42.30% <0.00%> (-40.39%)	⬇️
mlem/contrib/heroku/meta.py	54.28% <0.00%> (-31.43%)	⬇️
mlem/contrib/heroku/build.py	67.74% <0.00%> (-19.36%)	⬇️
mlem/api/utils.py	84.44% <0.00%> (-4.45%)	⬇️
mlem/contrib/docker/base.py	81.21% <0.00%> (-4.42%)	⬇️
mlem/core/objects.py	87.40% <0.00%> (-3.71%)	⬇️
mlem/core/meta_io.py	94.33% <0.00%> (-0.63%)	⬇️

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