[Feature] Update latest version in README.

Author: zhanghai

README.md

@@ -36,7 +36,7 @@ This library is loosely based on the following AOSP implementations:
 Gradle:
 
 ```gradle
-implementation 'me.zhanghai.android.fastscroll:library:1.1.7'
+implementation 'me.zhanghai.android.fastscroll:library:1.1.8'
 ```
 
 This library uses [Java 8 bytecode](https://developer.android.com/studio/write/java8-support), so you will need to enable it in your project as well: