Bump to v2.8.1

Author: robertwu1

apps/OboeTester/app/build.gradle

@@ -6,8 +6,8 @@ android {
         applicationId = "com.mobileer.oboetester"
         minSdkVersion 23
         targetSdkVersion 36
-        versionCode 104
-        versionName "2.8.0"
+        versionCode 105
+        versionName "2.8.1"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
             cmake {