Fix Codecov ignore settings for external libraries

[donnemartin]

Running coverage locally results in a 93% coverage rate.

Name                                                               Stmts   Miss  Cover
--------------------------------------------------------------------------------------
.tox/py35/lib/python3.5/site-packages/gitsome/__init__.py              1      0   100%
.tox/py35/lib/python3.5/site-packages/gitsome/completer.py            73      4    95%
.tox/py35/lib/python3.5/site-packages/gitsome/completions.py          12      0   100%
.tox/py35/lib/python3.5/site-packages/gitsome/completions_git.py       2      0   100%
.tox/py35/lib/python3.5/site-packages/gitsome/config.py              254     30    88%
.tox/py35/lib/python3.5/site-packages/gitsome/formatter.py           218      4    98%
.tox/py35/lib/python3.5/site-packages/gitsome/github.py              285     26    91%
.tox/py35/lib/python3.5/site-packages/gitsome/githubcli.py           158      0   100%
.tox/py35/lib/python3.5/site-packages/gitsome/rss_feed.py              1      0   100%
.tox/py35/lib/python3.5/site-packages/gitsome/table.py                69      7    90%
.tox/py35/lib/python3.5/site-packages/gitsome/utils.py                63      6    90%
.tox/py35/lib/python3.5/site-packages/gitsome/view_entry.py           16      2    88%
.tox/py35/lib/python3.5/site-packages/gitsome/web_viewer.py           72      3    96%
--------------------------------------------------------------------------------------
TOTAL                                                               1224     82    93%

Codecov is showing 51% coverage since it isn't properly excluding external libraries in the gitsome/lib folder.

The ignores in codecov.yml don't seem to be working.

Docs reference.

[donnemartin]

Fixed with:

• 8f41622
• d61fc0d

[coracobra]

hello world