Bump OboeTester to v2.8.4

apps/OboeTester/app/build.gradle

diff --git a/apps/OboeTester/app/build.gradle b/apps/OboeTester/app/build.gradle
index eac0458..42fba54 100644
--- a/apps/OboeTester/app/build.gradle
+++ b/apps/OboeTester/app/build.gradle
@@ -6,8 +6,8 @@
         applicationId = "com.mobileer.oboetester"
         minSdkVersion 23
         targetSdkVersion 36
-        versionCode 107
-        versionName "2.8.3"
+        versionCode 108
+        versionName "2.8.4"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {