:tada: add release template for v1.2.0

[zwpaper]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.34%. Comparing base (0e70dbd) to head (84f2913).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1020   +/-   ##
=======================================
  Coverage   84.34%   84.34%           
=======================================
  Files          53       53           
  Lines        5111     5111           
=======================================
  Hits         4311     4311           
  Misses        800      800           

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