chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-12-14 18:54:17,400 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-servicedirectory/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2020-12-14 18:54:18,323 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/a81b20ae-e9ff-48d3-8614-634cd6f7347c/targets

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[yoshi-approver]

Rubber stamped PR!

[codecov]

Codecov Report

Merging #255 (10830a5) into master (21d9b2b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #255   +/-   ##
=========================================
  Coverage     78.90%   78.90%           
  Complexity      342      342           
=========================================
  Files            24       24           
  Lines          2380     2380           
  Branches         22       22           
=========================================
  Hits           1878     1878           
  Misses          456      456           
  Partials         46       46           

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