release 1.2.0

[quininer]

Due to recent new use cases, this version introduces several new methods.

1. Implemented BoxedRawValue, which is the boxed version of RawValue. note that it also requires the buffer is contiguous.
2. Add custom kind to decode error
3. Some helper

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.82%. Comparing base (01b3c1f) to head (adf93e9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
+ Coverage   84.92%   85.82%   +0.89%     
==========================================
  Files          11       11              
  Lines        1838     1912      +74     
==========================================
+ Hits         1561     1641      +80     
+ Misses        277      271       -6     

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