Bump io.swagger:swagger-codegen to 2.4.16

[macisamuele]

As the title says.

The goal of this is to prepare a branch to address the addition of OpenAPI v3 (#51) and ideally we might (even if I doubt) reduce some conflicts.

Still bumping a dependency is not a bad idea, especially if tests continue to be green

[codecov]

Codecov Report

Merging #143 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #143   +/-   ##
=========================================
  Coverage     71.95%   71.95%           
  Complexity      139      139           
=========================================
  Files            11       11           
  Lines           574      574           
  Branches         75       75           
=========================================
  Hits            413      413           
  Misses          118      118           
  Partials         43       43           

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[macisamuele]

Ps.the title is inaccurate...the bump is to patch 16