[Feature] Bump version to 1.1.9.

Author: zhanghai

gradle.properties

@@ -16,8 +16,8 @@ android.enableJetifier=true
 android.useAndroidX=true
 
 GROUP=me.zhanghai.android.fastscroll
-VERSION_NAME=1.1.8
-VERSION_CODE=15
+VERSION_NAME=1.1.9
+VERSION_CODE=16
 
 POM_DESCRIPTION=Fast scroll for Android RecyclerView and more
 POM_INCEPTION_YEAR=2019