Update README.md

Author: jiang111

README.md

@@ -2,9 +2,9 @@
 用于学习RxJava操作符的app,全新升级,更漂亮
 
 ###展示:
-<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/1.png" width=300  alt="" />
-<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/2.png" width=300  alt="" />
-<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/3.png" width=300  alt="" />
+<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/1.png" width=270  alt="" />
+<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/2.png" width=270  alt="" />
+<img src="https://raw.githubusercontent.com/jiang111/RxJavaApp/master/app/art/3.png" width=270  alt="" />
 
 ###下载地址
 >* fir.im <br />http://fir.im/bpdu