chore: Update version number (#2322)

Author: atm1504

app/build.gradle

@@ -22,8 +22,8 @@ android {
         applicationId "ai.susi"
         minSdkVersion rootConfiguration.minSdkVersion
         targetSdkVersion rootConfiguration.targetSdkVersion
-        versionCode 17
-        versionName "1.2.0"
+        versionCode 18
+        versionName "1.3.0"
         vectorDrawables.useSupportLibrary = true
         // for unit test
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"