Add an intentionally broken link to verify CI is working as expected

[benjaminoakes]

Just testing CI for #16.

[benjaminoakes]

Got expected output:

URL        `intentionally-broken-link.html'
Name       `Intentionally Broken Link'
Parent URL file:///home/travis/build/techcorridorio/techcorridorio.github.io/_site/companies.html, line 77, col 243
Real URL   file:///home/travis/build/techcorridorio/techcorridorio.github.io/_site/intentionally-broken-link.html
Check time 0.001 seconds
Result     Error: URLError: <urlopen error [Errno 2] No such file or directory: '/home/travis/build/techcorridorio/techcorridorio.github.io/_site/intentionally-broken-link.html'>