Fix error on comparing git.Remote

[tzing]

We can't use 'foo' in repo.remotes syntax in current version, but 'foo' in repo.refs works fine.

It raises AttributeError before it runs full name search:

In [2]: r=git.Repo('.')
In [3]: 'origin'inr.remotes---------------------------------------------------------------------------AttributeErrorTraceback (mostrecentcalllast)
<ipython-input-3-800621fb1c9b>in<module>---->1'origin'inr.remotes~/Projects/GitPython/git/util.pyin__contains__(self, attr)
865def__contains__(self, attr):
866# first try identity match for performance-->867rval=list.__contains__(self, attr)
868ifrval:
869returnrval~/Projects/GitPython/git/remote.pyin__eq__(self, other)
449450def__eq__(self, other):
-->451returnself.name==other.name452453def__ne__(self, other):
AttributeError: 'str'objecthasnoattribute'name'

fix it add type check before it compares name.

[codecov-io]

Codecov Report

Merging #839 into master will decrease coverage by 0.12%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #839 +/- ##
==========================================
- Coverage 94.79% 94.67% -0.13% 
==========================================
Files 59 59 Lines 9603 9386 -217 ==========================================
- Hits 9103 8886 -217 
Misses 500 500

Impacted Files	Coverage Δ
git/objects/tree.py	59.64% <0%> (-0.93%)	⬇️
git/index/util.py	90.69% <0%> (-0.61%)	⬇️
git/index/typ.py	96.82% <0%> (-0.58%)	⬇️
git/refs/log.py	93.84% <0%> (-0.53%)	⬇️
git/objects/base.py	95.83% <0%> (-0.33%)	⬇️
git/refs/tag.py	96.66% <0%> (-0.31%)	⬇️
git/test/lib/helper.py	91.86% <0%> (-0.28%)	⬇️
git/refs/reference.py	95.74% <0%> (-0.26%)	⬇️
git/objects/commit.py	91.59% <0%> (-0.25%)	⬇️
git/cmd.py	83.83% <0%> (-0.18%)	⬇️
... and 26 more

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[Byron]

My apologies for the late reply - I must have missed this PR :(!
Thanks a lot for your contribution!