chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2021-02-26 01:22:04,870 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-bigquery/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-02-26 01:22:06,494 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

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[codecov]

Codecov Report

Merging #1146 (494393b) into master (77790cd) will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1146      +/-   ##
============================================
+ Coverage     80.10%   80.17%   +0.07%     
  Complexity     1270     1270              
============================================
  Files            79       79              
  Lines          6619     6629      +10     
  Branches        756      766      +10     
============================================
+ Hits           5302     5315      +13     
- Misses          914      916       +2     
+ Partials        403      398       -5     

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/bigquery/spi/v2/HttpBigQueryRpc.java	4.36% <0.00%> (-0.03%)	2.00% <0.00%> (ø%)
...n/java/com/google/cloud/bigquery/BigQueryImpl.java	83.03% <0.00%> (+0.14%)	86.00% <0.00%> (ø%)
...src/main/java/com/google/cloud/bigquery/Field.java	83.49% <0.00%> (+0.16%)	27.00% <0.00%> (ø%)
...google/cloud/bigquery/StandardTableDefinition.java	93.33% <0.00%> (+0.18%)	16.00% <0.00%> (ø%)
...m/google/cloud/bigquery/QueryJobConfiguration.java	90.21% <0.00%> (+0.27%)	67.00% <0.00%> (ø%)
...a/com/google/cloud/bigquery/InsertAllResponse.java	89.18% <0.00%> (+0.30%)	15.00% <0.00%> (ø%)
...om/google/cloud/bigquery/LoadJobConfiguration.java	93.20% <0.00%> (+0.43%)	56.00% <0.00%> (ø%)
...ogle/cloud/bigquery/WriteChannelConfiguration.java	86.81% <0.00%> (+0.57%)	46.00% <0.00%> (ø%)
...a/com/google/cloud/bigquery/BigQueryException.java	72.97% <0.00%> (+2.70%)	14.00% <0.00%> (ø%)

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[yoshi-approver]

Rubber stamped PR!