update readme

Author: ztiany

README.md

@@ -5,32 +5,30 @@
 - 自动加载更多、点击加载更多
 - 可配置 load more View
 - 兼容自定义的 LayoutManager
+ 
+## Usage
 
-# 使用方式
-
-
-## 创建 WrapperAdapter 与控制器
+创建 WrapperAdapter 与控制器：
 
 ```java
-              mWrapperAdapter = WrapperAdapter.wrap(mAdapter);
-              mWrapperAdapter.setLoadMode(LoadMode.CLICK_LOAD);
-              
-              mWrapperAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
-                     @Override
-                     public boolean canLoadMore() {
-                         return true;
-                     }
-         
-                     @Override
-                     public void onLoadMore() {
-                          ...
-                     }
-                     
-              mRecyclerView.setAdapter(mWrapperAdapter);
+mWrapperAdapter = WrapperAdapter.wrap(mAdapter);
+mWrapperAdapter.setLoadMode(LoadMode.CLICK_LOAD);
+
+mWrapperAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
+     @Override
+     public boolean canLoadMore() {
+         return true;
+     }
+
+     @Override
+     public void onLoadMore() {
+          ...
+     }
+     
+mRecyclerView.setAdapter(mWrapperAdapter);
 ```
 
-
-# Gradle
+## Gradle
 
 ```
 maven { url 'https://jitpack.io' }

library/build.gradle

@@ -26,4 +26,4 @@ dependencies {
     compileOnly 'androidx.recyclerview:recyclerview:1.0.0'
 }
 
-group='com.github.Ztiany'
+group='com.github.ztiany'