Log Message:
erlang-p1_utils: Update to 1.0.21

upstream changes:
-----------------
Version 1.0.21
  * Update travis config

Version 1.0.19
  * Fix compatibility issues with Erlang 23

Version 1.0.18
  * Update copyright year

Version 1.0.17
  * Fix formating of error messages

Version 1.0.16
  * Update type specs
  * Avoid lengthy output of p1_prof:m/r/q commands

Version 1.0.15
  * Add p1_prof module

Version 1.0.14
  * Add contribution guide
  * Remove exec bit from doc/style.css

Version 1.0.13
  * Add p1_rand and shaper module