pyepics is not importable with Python 3

@ucegg : I cannot reproduce this behaviour, so please elaborate on this issue.

My try shows the following expected behaviour:

messuser@las94:~$ python2
Python 2.7.15 (default, Oct 15 2018, 18:36:25)
[GCC 7.3.1 20180712 (Red Hat 7.3.1-6)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import epics
>>> exit()
messuser@las94:~$ python3
Python 3.6.6 (default, Jul 19 2018, 16:29:00)
[GCC 7.3.1 20180303 (Red Hat 7.3.1-5)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import epics
>>> exit()

and not an ImportError