Update branch references and links

[blink1073]

cf #789

[codecov-commenter]

Codecov Report

Merging #791 (856e2ea) into 1.x (64555ff) will decrease coverage by 0.38%.
The diff coverage is n/a.

❗ Current head 856e2ea differs from pull request most recent head 58f9684. Consider uploading reports for the commit 58f9684 to get more accurate results

@@            Coverage Diff             @@
##              1.x     #791      +/-   ##
==========================================
- Coverage   70.50%   70.12%   -0.39%     
==========================================
  Files          62       62              
  Lines        7555     7555              
  Branches     1248     1245       -3     
==========================================
- Hits         5327     5298      -29     
- Misses       1840     1868      +28     
- Partials      388      389       +1     

Impacted Files	Coverage Δ
jupyter_server/base/zmqhandlers.py	52.40% <0.00%> (-4.28%)	⬇️
jupyter_server/services/kernels/kernelmanager.py	78.66% <0.00%> (-3.00%)	⬇️
jupyter_server/services/kernels/handlers.py	57.65% <0.00%> (-1.07%)	⬇️
jupyter_server/services/contents/filemanager.py	71.95% <0.00%> (-0.83%)	⬇️
jupyter_server/gateway/handlers.py	31.25% <0.00%> (-0.63%)	⬇️
jupyter_server/serverapp.py	65.07% <0.00%> (-0.19%)	⬇️

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