Fix AssertionError in test_project::test_project

[dcslagel]

This pull-request resolves the following error in the current test suite:
FAILED tests/test_project.py::test_project - AssertionError: assert '1' == 1
This issue exists on both the master and the develop branches.

It is evaluating assert project.uwis[0] which stores a str object.

coverage report after this change:

Name                      Stmts   Miss  Cover
---------------------------------------------
welly/__init__.py            16      2    88%
welly/_version.py             2      0   100%
welly/canstrat.py           102     23    77%
welly/canstrat_codes.py      23      0   100%
welly/crs.py                 49      7    86%
welly/curve.py              382    114    70%
welly/defaults.py             2      0   100%
welly/fields.py               2      0   100%
welly/header.py              30      8    73%
welly/location.py           153     58    62%
welly/project.py            353    198    44%
welly/quality.py             81     31    62%
welly/scales.py              56     22    61%
welly/synthetic.py           47      9    81%
welly/tools.py                7      1    86%
welly/utils.py              200     44    78%
welly/well.py               523    203    61%
---------------------------------------------
TOTAL                      2028    720    64%

Let me know if this change could be accepted (or rejected) or
needs some additional changes before being approved and merged.

Thank you,
DC

[kwinkunks]

Thank you! - Matt