chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-04-12 20:16:23,831 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-container/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-12 20:16:25,092 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/a4725cb4-2829-4cf6-a7d8-fc3f440702d7/targets

• To automatically regenerate this PR, check this box. (May take up to 24 hours.)

[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #422 (f44fb9e) into master (e038433) will decrease coverage by 0.93%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #422      +/-   ##
============================================
- Coverage     87.04%   86.10%   -0.94%     
+ Complexity      238      199      -39     
============================================
  Files             7        7              
  Lines          1667     1562     -105     
  Branches          3        3              
============================================
- Hits           1451     1345     -106     
- Misses          214      215       +1     
  Partials          2        2              

Impacted Files	Coverage Δ	Complexity Δ
...oogle/cloud/container/v1/ClusterManagerClient.java	94.44% <0.00%> (-0.62%)	114.00% <0.00%> (-37.00%)
.../container/v1/stub/ClusterManagerStubSettings.java	85.90% <0.00%> (-0.41%)	41.00% <0.00%> (-1.00%)
...loud/container/v1/stub/GrpcClusterManagerStub.java	98.48% <0.00%> (-0.13%)	38.00% <0.00%> (-1.00%)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e038433...f44fb9e. Read the comment docs.