Log Message:
py-distro: update to 1.5.0.

## 1.5.0 (2020.3.30)

BACKWARD COMPATIBILITY:
* Keep output as native string so we can compatible with python2 interface \ 
[[#248](https://github.com/nir0s/distro/pull/248)]

ENHANCEMENTS:

BUG FIXES:
* Fix detection of RHEL 6 ComputeNode \ 
[[#255](https://github.com/nir0s/distro/issues/255)]
* Fix Oracle 4/5 lsb_release id and names \ 
[[#250](https://github.com/nir0s/distro/pull/250)]
* Ignore /etc/plesk-release file while parsing distribution \ 
[[#246](https://github.com/nir0s/distro/pull/246)]

TESTS:
* Test on MidnightBSD [[#254](https://github.com/nir0s/distro/issues/254)]

RELEASE:
* Remove build testing on Python 3.3 and add pypy 3.5 and Python 3.7 and 3.8 \ 
[[#244](https://github.com/nir0s/distro/pull/244)]
* Fix Windows build due to Appveyor not supporting builds on Python 2.7 anymore \ 
[[#257](https://github.com/nir0s/distro/pull/257)]

Additionally, The Python2.6 branch was fixed to support distro version 1.4.0. It \ 
is now passing all tests. Thanks [abadger](https://github.com/abadger)!