Python 3.6 pip3 doesn't fully uninstall JEP

[keith3k]

Describe the problem
I upgraded from JEP 3.8.2 to 3.9.0 and then encountered a build issue because some of the old 3.8.2 files remained in place next to the 3.9.0. PIP3 correctly attempts to uninstall the previous version before installing the new one. The problem is "pip3 uninstall jep" leaves the old jep 3.8.2 jar file in place, causing possible Java build conflicts.

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Environment (please complete the following information):

• OS Platform, Distribution, and Version: Ubunut 18.04
• Python Distribution and Version: Python 3.6, PIP 20.0.2
• Java Distribution and Version: OpenJDK Runtime Environment (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)
• Jep Version: 3.8.2 -> 3.9.0
• Python packages used (e.g. numpy, pandas, tensorflow): numpy,scipy,matplotlib,jep,pillow

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