chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 01:56:18,048 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigtable/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 01:56:19,126 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #661 (199a8db) into master (3d9bea6) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #661      +/-   ##
============================================
- Coverage     83.54%   83.52%   -0.02%     
  Complexity     1198     1198              
============================================
  Files           110      110              
  Lines          7309     7309              
  Branches        383      383              
============================================
- Hits           6106     6105       -1     
- Misses         1003     1005       +2     
+ Partials        200      199       -1     

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/bigtable/emulator/v2/Emulator.java	59.83% <0.00%> (-0.82%)	14.00% <0.00%> (ø%)

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