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
Version 1.0.2
- Add p1_time_compat module to ease support for both R17 and R18 Erlang
time features
Version 1.0.1
- Better Rebar3 support, remove warning about missing hex plugin when
building with rebar
Version 1.0.0
- Add build state
- Only looks for missing functions
- We do not need gcov support (No C code)
- Add initial travis file
- Switch deprecated hex.pm field
- Prepare hex.pm release
- This is a library. Switching to Apache v2 to make it widely usable.
- Revert "Do not check for generic_debug option"