customs: github url with trailing slash is validated. Fixes #1807

[Prashant-Surya]

No description provided.

[codecov-io]

Codecov Report

Merging #1813 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1813      +/-   ##
==========================================
- Coverage   78.27%   78.24%   -0.04%     
==========================================
  Files          68       68              
  Lines        5764     5764              
==========================================
- Hits         4512     4510       -2     
- Misses       1252     1254       +2

Impacted Files	Coverage Δ
mysite/customs/forms.py	97.7% <ø> (ø)	⬆️
mysite/customs/feed.py	96.42% <0%> (-3.58%)	⬇️

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[coveralls]

Coverage decreased (-0.03%) to 78.568% when pulling 85f512c on Prashant-Surya:issue-1807 into ce29352 on openhatch:master.