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ACRA 4.11 crashes during init with targetSdkVersion set to R (30)

Looks like we'll need to migrate to ACRA 5 before targetting API 30. The crash doesn't happen on the API 30 emulator with targetSdkVersion set to 29, so this isn't urgent.

2020-03-31 11:02:33.685 25167-25167/org.briarproject.briar.android.debug E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.briarproject.briar.android.debug, PID: 25167
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/android/internal/util/Predicate;
        at org.acra.util.IOUtils.streamToString(IOUtils.java:84)
        at org.acra.ACRA.getCurrentProcessName(ACRA.java:303)
        at org.acra.ACRA.isACRASenderServiceProcess(ACRA.java:294)
        at org.acra.ACRA.init(ACRA.java:210)
        at org.acra.ACRA.init(ACRA.java:173)
        at org.acra.ACRA.init(ACRA.java:157)
        at org.acra.ACRA.init(ACRA.java:140)
        at org.briarproject.briar.android.BriarApplicationImpl.attachBaseContext(BriarApplicationImpl.java:100)
        at android.app.Application.attach(Application.java:351)
        at android.app.Instrumentation.newApplication(Instrumentation.java:1159)
        at android.app.LoadedApk.makeApplication(LoadedApk.java:1203)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6521)
        at android.app.ActivityThread.access$1300(ActivityThread.java:229)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1885)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:216)
        at android.app.ActivityThread.main(ActivityThread.java:7464)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:955)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.internal.util.Predicate" on path: DexPathList[[zip file "/data/app/~~g6kWDR95CtejUwuMSRctEg==/org.briarproject.briar.android.debug-C8FXbrMV6GsjIoTVns77-A==/base.apk"],nativeLibraryDirectories=[/data/app/~~g6kWDR95CtejUwuMSRctEg==/org.briarproject.briar.android.debug-C8FXbrMV6GsjIoTVns77-A==/lib/x86, /system/lib, /system_ext/lib, /product/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:202)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at org.acra.util.IOUtils.streamToString(IOUtils.java:84) 
        at org.acra.ACRA.getCurrentProcessName(ACRA.java:303) 
        at org.acra.ACRA.isACRASenderServiceProcess(ACRA.java:294) 
        at org.acra.ACRA.init(ACRA.java:210) 
        at org.acra.ACRA.init(ACRA.java:173) 
        at org.acra.ACRA.init(ACRA.java:157) 
        at org.acra.ACRA.init(ACRA.java:140) 
        at org.briarproject.briar.android.BriarApplicationImpl.attachBaseContext(BriarApplicationImpl.java:100) 
        at android.app.Application.attach(Application.java:351) 
        at android.app.Instrumentation.newApplication(Instrumentation.java:1159) 
        at android.app.LoadedApk.makeApplication(LoadedApk.java:1203) 
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6521) 
        at android.app.ActivityThread.access$1300(ActivityThread.java:229) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1885) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:216) 
        at android.app.ActivityThread.main(ActivityThread.java:7464) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:549) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:955)