chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 19:39:19,146 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-storage/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 19:39:20,008 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/461024dc-641c-4e18-8895-243203909d09/targets

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[codecov]

Codecov Report

Merging #743 (eefd68c) into master (bac66b2) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #743      +/-   ##
============================================
+ Coverage     64.52%   64.60%   +0.07%     
  Complexity      634      634              
============================================
  Files            32       32              
  Lines          5311     5311              
  Branches        516      519       +3     
============================================
+ Hits           3427     3431       +4     
  Misses         1718     1718              
+ Partials        166      162       -4     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/google/cloud/storage/BucketInfo.java	83.97% <0.00%> (+0.30%)	86.00% <0.00%> (ø%)
...in/java/com/google/cloud/storage/StorageBatch.java	92.00% <0.00%> (+4.00%)	13.00% <0.00%> (ø%)

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[yoshi-approver]

Rubber stamped PR!