Upgrade androidasync library to avoid problems with new gradle versions #240
Description
We use the 2.1.3 version of the library com.koushikdutta.async:androidasync to handle websockets and async HTTP calls in Simperium. After upgrading Gradle to 7.x in Simplenote, which uses the Simperium client, the debug builds break. androidasync crashes the app because of a java.lang.AssertionError.
According to koush/ion#937, the version 3.1.0 solves this problem.