Update Kontalk to 3.0-beta4 (37)

metadata/org.kontalk.txt

@@ -142,6 +142,14 @@ Build:3.0-beta3,36
     gradle=basic
     prebuild=sed -i -e "/googleplayCompile/d" build.gradle
 
+Build:3.0-beta4,37
+    commit=v3.0-beta4
+    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
+
 Maintainer Notes:
 * make sure mavenLocal works on build server
 * replace commit with tag once released