rxdroid at.jclehner.rxdroid metadata

Open username-removed-1248784 requested to merge k3agit/fdroiddata:master into master

I wrote metadata for GPL RxDroid, problem is I am not the original author and I don't develop android apps yet so I was unable to test whether it would compile successfully.

When I used Gradle 3.2 from Android studio on my machine and did fdroid build -v -l at.jclehner.rxdroid it resulted in

* What went wrong:
A problem occurred evaluating root project 'RxDroid'.
> Failed to apply plugin [id 'com.android.application']
   > Gradle version 2.10 is required. Current version is 3.2. If using the gradle wrapper, try editing the distributionUrl in /temp/fdroiddata/build/at.jclehner.rxdroid/gradle/wrapper/gradle-wrapper.properties to gradle-2.10-all.zip

I would like to see RxDroid in F-Droid. Thanks!