chore: update README to use autosynth

[stephaniewang526]

No description provided.

[codecov]

Codecov Report

Merging #290 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #290      +/-   ##
============================================
+ Coverage     77.54%   77.59%   +0.05%     
- Complexity     1151     1158       +7     
============================================
  Files            75       76       +1     
  Lines          6091     6110      +19     
  Branches        654      656       +2     
============================================
+ Hits           4723     4741      +18     
- Misses         1019     1020       +1     
  Partials        349      349              

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/cloud/bigquery/PolicyTags.java	100.00% <0.00%> (ø)	5.00% <0.00%> (?%)
...src/main/java/com/google/cloud/bigquery/Field.java	83.33% <0.00%> (+0.72%)	27.00% <0.00%> (+2.00%)

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