mucommander: 0.9.2 -> 0.9.3-3
mucommander: 0.9.2 -> 0.9.3-3

Mucommander 0.9.3-3 was released in January 2019.

* comment out `proguard.enabled = ...` in build.gradle
* use Gradle 4.10 (upstream uses 4.8)
* fix version in build.gradle

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