Fix build/release issues

[chrisbetz]

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Hi,

for building a release containing your latest commits/PRs (#222), I needed to setup and build my own version of kibit.

I fixed some issues you might want to copy over to your project.

• Use git version tagging (using lein v)
• Automated creation of version file to reference (so it's just a lein release :patch to actually release a new version)
• Fixed JDK11 build on TravisCI
• Added "get started building kibit/lein-kibit" section to README
• Added / fixed badges in README
• Updated CHANGELOG.md (and using lein changelog for managing during release)
• Updated dependencies

Feel free to take whatever you like and dismiss everything else.

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This change is 

[dijonkitchen]

Any update on this? I think it fixes #229

[danielcompton]

I've got a bunch of review comments that are blocking merging of this PR. I'll do a separate release though.