metadata value should decode.

[pengweiqhca]

Fix #73

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@06b1b94). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #74   +/-   ##
=========================================
  Coverage          ?   96.87%           
  Complexity        ?      177           
=========================================
  Files             ?       17           
  Lines             ?      671           
  Branches          ?       39           
=========================================
  Hits              ?      650           
  Misses            ?       15           
  Partials          ?        6           

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[huynhminhtan]

Hi @pengweiqhca, thank you for your pull request. It has been merged into master.