Add .vscode to .gitignore

[chrisgorgo]

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[codecov]

Codecov Report

Merging #837 into master will decrease coverage by 0.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #837      +/-   ##
==========================================
- Coverage   90.36%   89.91%   -0.46%     
==========================================
  Files          96       98       +2     
  Lines       12196    12305     +109     
  Branches     2136     2154      +18     
==========================================
+ Hits        11021    11064      +43     
- Misses        832      896      +64     
- Partials      343      345       +2

Impacted Files	Coverage Δ
nibabel/testing_pytest/__init__.py	40% <0%> (ø)
nibabel/testing_pytest/np_features.py	33.33% <0%> (ø)

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