Update Kontalk to 3.1-beta3 (73)

Fixes #302.

metadata/org.kontalk.txt

@@ -318,6 +318,15 @@ Build:3.1-beta2,72
     gradle=basic
     prebuild=sed -i -e "/googleplayCompile/d" build.gradle
 
+Build:3.1-beta3,73
+    commit=v3.1-beta3
+    subdir=app
+    submodules=yes
+    init=sed -i -e 's/signingConfig signingConfigs.release/{}/g' build.gradle
+    gradle=basic
+    prebuild=sed -i -e "/googleplayCompile/d" build.gradle
+    scanignore=app/src/main/res/raw/truststore
+
 Auto Update Mode:Version v%v
 Update Check Mode:Tags ^v[0-9.]*$
 Current Version:3.0.6