[build] update gradle-errorprone-plugin to 1.1.0

[grimreaper]

Problem
The plugin for error-prone is out of date

Solution
Update the plugin.

• Read the contributing guide
• PR should be motivated, i.e. what does it fix, why, and if relevant how
• If possible / relevant include an example in the description, that could help all readers
  including project members to get a better picture of the change
• Avoid other runtime dependencies
• Meaningful commit history ; intention is important please rebase your commit history so that each
  commit is meaningful and help the people that will explore a change in 2 years
• The pull request follows coding style
• Mention Fixes #<issue number> in the description if relevant
• At least one commit should mention Fixes #<issue number> if relevant

[TimvdLippe]

We should probably first update our Travis testing matrix to remove testing on Java 9 and 10, and adding Java 14. Then we can look into the failures with ErrorProne on Java 12. I will also contact the ErrorProne team to get them look at the problems.

[grimreaper]

agreed: though this is unrelated. I just tried this before realizing the problem was java 12 :)

[TimvdLippe]

Apparently the JDK 12 issue is being tracked at google/error-prone#1106

[codecov-io]

Codecov Report

Merging #1908 into release/3.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.x    #1908   +/-   ##
==============================================
  Coverage          86.67%   86.67%           
  Complexity          2526     2526           
==============================================
  Files                318      318           
  Lines               6650     6650           
  Branches             832      832           
==============================================
  Hits                5764     5764           
  Misses               685      685           
  Partials             201      201           

---

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[TimvdLippe]

Upstream has fixed their support for newer versions of Java. @grimreaper could you rebase this PR?

[codecov-commenter]

Codecov Report

Merging #1908 into release/3.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/3.x    #1908   +/-   ##
==============================================
  Coverage          85.76%   85.76%           
  Complexity          2542     2542           
==============================================
  Files                318      318           
  Lines               7209     7209           
  Branches             861      861           
==============================================
  Hits                6183     6183           
  Misses               810      810           
  Partials             216      216           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4fd405d...fac7716. Read the comment docs.

[grimreaper]

done