library: add proguard consumer rules

[amartinz]

No description provided.

[codecov-io]

Current coverage is 88.20% (diff: 100%)

Merging #8 into master will not change coverage

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[amartinz]

not complete though, Geofencer is still acting up, gradle cached my build and it showed up after clearing the cache and the project.

[patloew]

The Geocoder class does not exist anymore. I renamed it to Geocoding before release. I guess some class files were still cached and included in the library. Lesson learned – always do a clean before making a release build 😉 Thanks for the PR.

[amartinz]

... and I turned it into Geofencer in comments, so we have 3 variants to choose now :-D

You are welcome, thanks for this library!