feat: remove block version changes

[elrrrrrrr]

删除 changesStream 中的 package block version 类型事件。

[codecov[bot]]

Codecov Report

Merging #1737 (0bd5117) into master (8ac988a) will decrease coverage by 0.37%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1737      +/-   ##
==========================================
- Coverage   85.97%   85.60%   -0.38%     
==========================================
  Files         103      103              
  Lines        4821     4821              
  Branches      922      922              
==========================================
- Hits         4145     4127      -18     
- Misses        676      694      +18     

Impacted Files	Coverage Δ
controllers/registry/package/changes.js	94.44% <ø> (ø)
controllers/sync_module_worker.js	77.53% <0.00%> (-1.68%)	:arrow_down:

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[killagu]

+ cnpmjs.org@3.0.0-rc.63