Makefile: Filter version tags for version calculation

[anikeev-yadro]

Summary:
only tags that start with "v" will be accounted for in VERSION calculation.

Motivation:
this allows us to use any custom tags along with tags that denote releases

[codecov]

Codecov Report

Merging #2641 (7340a06) into master (509cdec) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2641      +/-   ##
==========================================
- Coverage   84.91%   84.88%   -0.03%     
==========================================
  Files         304      311       +7     
  Lines       38370    38556     +186     
==========================================
+ Hits        32580    32729     +149     
- Misses       4409     4452      +43     
+ Partials     1381     1375       -6     

Impacted Files	Coverage Δ
pkg/rpcclient/nep17.go	44.15% <0.00%> (-24.68%)	⬇️
pkg/services/oracle/oracle.go	72.79% <0.00%> (-14.71%)	⬇️
pkg/services/oracle/request.go	57.99% <0.00%> (-5.03%)	⬇️
pkg/core/transaction/transaction.go	85.18% <0.00%> (-1.49%)	⬇️
pkg/rpcclient/rpc.go	79.41% <0.00%> (-0.39%)	⬇️
cli/wallet/nep17.go	71.26% <0.00%> (-0.30%)	⬇️
cli/wallet/wallet.go	84.41% <0.00%> (-0.30%)	⬇️
pkg/compiler/codegen.go	92.22% <0.00%> (-0.15%)	⬇️
pkg/rpcclient/native.go	56.17% <0.00%> (ø)
pkg/rpcclient/policy.go	65.38% <0.00%> (ø)
... and 17 more

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[roman-khimov]

While this makes sense, please take a look at the commit history in this repository and reformat the commit message appropriately. It should be something like Makefile: filter ... and it'd be nice to add a note on why do need this.

[anikeev-yadro]

reformated. Please review.