Update to Swift 3.1

[youming-lin]

No description provided.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@e6d69fb). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #16   +/-   ##
=========================================
  Coverage          ?   74.52%           
=========================================
  Files             ?        2           
  Lines             ?      318           
  Branches          ?        0           
=========================================
  Hits              ?      237           
  Misses            ?       81           
  Partials          ?        0

Flag	Coverage Δ
#CloudFoundryConfig	74.52% <ø> (?)
#HerokuConfig	74.52% <ø> (?)

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