chore(ci): add build configuration for jruby

[bednar]

Closes #72

Proposed Changes

Add build configuration for jruby.

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• rake test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #78 (7584f6c) into master (caf9fb0) will increase coverage by 9.70%.
The diff coverage is n/a.

❗ Current head 7584f6c differs from pull request most recent head f11403f. Consider uploading reports for the commit f11403f to get more accurate results

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   89.61%   99.32%   +9.70%     
==========================================
  Files          18       15       -3     
  Lines        1011      737     -274     
==========================================
- Hits          906      732     -174     
+ Misses        105        5     -100     

Impacted Files	Coverage Δ
lib/influxdb2/apis/generated/configuration.rb
lib/influxdb2/apis/generated/api_client.rb
lib/influxdb2/apis/generated/api_error.rb

---

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 caf9fb0...f11403f. Read the comment docs.

[Esity]

Looks good, thanks for adding this