Update GroupMembershipChangeTest.kt

Author: giovas17

library/src/androidTest/java/org/xmtp/android/library/GroupMembershipChangeTest.kt

@@ -3,7 +3,6 @@ package org.xmtp.android.library
 import android.content.Context
 import androidx.test.core.app.ApplicationProvider
 import androidx.test.ext.junit.runners.AndroidJUnit4
-import androidx.test.platform.app.InstrumentationRegistry
 import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Ignore