allow msgpack 1.1.0

[ThomasWaldmann]

tests with 1.1.0rc1 were successful, thus I assume 1.1.0 will also work ok.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.24%. Comparing base (8470730) to head (7511cb6).
Report is 1 commits behind head on 1.2-maint.

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Additional details and impacted files

@@              Coverage Diff              @@
##           1.2-maint    #8227      +/-   ##
=============================================
- Coverage      82.54%   82.24%   -0.30%     
=============================================
  Files             38       38              
  Lines          10838    10838              
  Branches        2079     2079              
=============================================
- Hits            8946     8914      -32     
- Misses          1341     1365      +24     
- Partials         551      559       +8     

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