Release v0.68.2

[jansegre]

Changes

• feat(nano): Forbid negative balance during execution #1512
• feat(consensus): eliminate block ties #673
• feat(indexes): remove sync-v1 indexes #1200

Release-candidates

• Release-candidate v0.68.2-rc.1 #1514

Checklist

• I've read and followed the release process described in https://github.com/HathorNetwork/ops-tools/blob/master/docs/release-guides/hathor-core.md#stable-release
• The QA process was run successfully during the tests of the corresponding release-candidate(s)

[codecov]

Codecov Report

❌ Patch coverage is 95.90164% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.25%. Comparing base (c609757) to head (e73f2a5).
⚠️ Report is 8 commits behind head on release.

Files with missing lines	Patch %	Lines
hathor/nanocontracts/runner/runner.py	77.77%	1 Missing and 1 partial ⚠️
hathor/transaction/resources/mempool.py	0.00%	1 Missing and 1 partial ⚠️
hathor/consensus/block_consensus.py	97.14%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           release    #1515    +/-   ##
=========================================
  Coverage    86.24%   86.25%            
=========================================
  Files          440      437     -3     
  Lines        34063    33725   -338     
  Branches      5328     5265    -63     
=========================================
- Hits         29378    29089   -289     
+ Misses        3663     3624    -39     
+ Partials      1022     1012    -10     

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