Bump AHBottomNavigation version to 2.4.6

Only change is visibility modifier of createItems so it can now be overridden

lib/android/app/build.gradle

     implementation 'com.android.support:appcompat-v7:26.1.0'
     implementation 'com.android.support:support-v4:26.1.0'
 
-    implementation 'com.github.wix-playground:ahbottomnavigation:2.4.5'
+    implementation 'com.github.wix-playground:ahbottomnavigation:2.4.6'
     implementation 'com.github.wix-playground:reflow-animator:1.0.4'
     implementation 'com.github.clans:fab:1.6.4'