update readme

Author: donglua

README.md

@@ -28,11 +28,11 @@
 
 ```groovy
 dependencies {
-    compile 'me.iwf.photopicker:PhotoPicker:0.8.1@aar'
+    compile 'me.iwf.photopicker:PhotoPicker:0.8.4@aar'
     
-    compile 'com.android.support:appcompat-v7:23.4.1'
-    compile 'com.android.support:recyclerview-v7:23.4.1'
-    compile 'com.android.support:design:23.4.1'
+    compile 'com.android.support:appcompat-v7:23.4.0'
+    compile 'com.android.support:recyclerview-v7:23.4.0'
+    compile 'com.android.support:design:23.4.0'
     compile 'com.nineoldandroids:library:2.4.0'
     compile 'com.github.bumptech.glide:glide:3.7.0'
 }