chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-09 20:47:34,815 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-09 20:47:35,664 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/935f8f31-d7ea-4a0f-bf2f-d793400d62f5/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #751 (3b90a2b) into master (bb42107) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #751      +/-   ##
============================================
- Coverage     64.61%   64.57%   -0.05%     
+ Complexity      634      633       -1     
============================================
  Files            32       32              
  Lines          5313     5307       -6     
  Branches        519      503      -16     
============================================
- Hits           3433     3427       -6     
  Misses         1718     1718              
  Partials        162      162              

Impacted Files	Coverage Δ	Complexity Δ
...gle/cloud/storage/testing/RemoteStorageHelper.java	63.41% <0.00%> (-0.59%)	9.00% <0.00%> (ø%)
...e/src/main/java/com/google/cloud/storage/Blob.java	83.61% <0.00%> (-0.10%)	29.00% <0.00%> (-1.00%)
...ain/java/com/google/cloud/storage/StorageImpl.java	81.27% <0.00%> (-0.05%)	147.00% <0.00%> (ø%)
...main/java/com/google/cloud/storage/BucketInfo.java	83.95% <0.00%> (-0.03%)	86.00% <0.00%> (ø%)

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[yoshi-approver]

Rubber stamped PR!