Log Message:
py-uncertainties: updated to 3.1.4

3.1.4:
There is now a single code base for Python 2 and Python 3.

Python 2.7 is now the minimal Python version.

The installation can also now be done through a universal wheel, which helps \ 
with some external projects.

This Git version should have the same uncertainties code as PyPI version 3.1.4, \ 
but some accompanying files have been updated. This should have no impact on \ 
users. Developers are better off using this Git 3.1.4 version.