chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-03-04 19:39:22,261 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquery/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-03-04 19:39:23,268 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/8951d3c1-8c47-4c29-8339-6334f9eda8b8/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #1162 (11014e3) into master (8ab0a07) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1162      +/-   ##
============================================
- Coverage     80.17%   80.13%   -0.05%     
+ Complexity     1270     1269       -1     
============================================
  Files            79       79              
  Lines          6629     6609      -20     
  Branches        766      745      -21     
============================================
- Hits           5315     5296      -19     
+ Misses          916      915       -1     
  Partials        398      398              

Impacted Files	Coverage Δ	Complexity Δ
...com/google/cloud/bigquery/StandardSQLDataType.java	73.68% <0.00%> (-1.32%)	7.00% <0.00%> (ø%)
...m/google/cloud/bigquery/StandardSQLStructType.java	84.61% <0.00%> (-1.10%)	5.00% <0.00%> (ø%)
...gle/cloud/bigquery/MaterializedViewDefinition.java	70.00% <0.00%> (-0.97%)	6.00% <0.00%> (ø%)
...ava/com/google/cloud/bigquery/RoutineArgument.java	90.47% <0.00%> (-0.44%)	5.00% <0.00%> (ø%)
...va/com/google/cloud/bigquery/StandardSQLField.java	90.47% <0.00%> (-0.44%)	7.00% <0.00%> (ø%)
...java/com/google/cloud/bigquery/ViewDefinition.java	87.09% <0.00%> (-0.41%)	11.00% <0.00%> (ø%)
...google/cloud/bigquery/ExternalTableDefinition.java	58.18% <0.00%> (-0.38%)	21.00% <0.00%> (ø%)
...y/src/main/java/com/google/cloud/bigquery/Job.java	84.45% <0.00%> (-0.21%)	33.00% <0.00%> (-1.00%)
...om/google/cloud/bigquery/BigtableColumnFamily.java	95.83% <0.00%> (-0.17%)	5.00% <0.00%> (ø%)
...google/cloud/bigquery/StandardTableDefinition.java	93.24% <0.00%> (-0.10%)	16.00% <0.00%> (ø%)
... and 8 more

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[yoshi-approver]

Rubber stamped PR!