fix: Documentation: version number and usage

[jstuyts]

fix: Documentation: version number and usage

Updated version number to latest release.

Improved documentation:

• Synced Javadoc and README.md, correcting error about filter in Javadoc
• Made example in Javadoc more easy to read and copy

Made 2 fields final to prevent editor/compiler warning.

Fixes #91

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[codecov]

Codecov Report

Merging #92 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master      #92   +/-   ##
=========================================
  Coverage     68.05%   68.05%           
  Complexity       35       35           
=========================================
  Files             2        2           
  Lines           144      144           
  Branches         15       15           
=========================================
  Hits             98       98           
  Misses           33       33           
  Partials         13       13           

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/logging/logback/LoggingAppender.java	67.39% <100.00%> (ø)	31.00 <0.00> (ø)

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[jstuyts]

@googlebot I signed it!

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[jstuyts]

@kolea2 It looks like your CI is using google-java-format built using JDK 11, but the build is started with JDK 8. The build fails because the build JDK does not understand the google-java-format class files.

[kolea2]

Hi @jstuyts, thanks for your patience - I believe this issue should be fixed. Can you try rerunning your presubmit checks?

[jstuyts]

I spent 10 minutes trying to find the rerun button or command, but I cannot find it.

[kolea2]

@jstuyts I was able to rerun them! Edit: adding the GitHub workflow instructions: https://help.github.com/en/actions/configuring-and-managing-workflows/managing-a-workflow-run#viewing-your-workflow-history Unfortunately, it looks like it's still failing. @chingor13 can you help take a look here?

[chingor13]

Thanks!