change readme

Author: YangSen-qn

README.md

@@ -15,7 +15,7 @@ https://github.com/qiniudemo/qiniu-lab-android
 
 | Qiniu SDK 版本 | 最低 Android版本   |       依赖库版本           |
 |------------ |-----------------|------------------------|
-|  8.3.0        |  Android 4.0+     |        okhttp 4+         |
+|  8.3.1+       |  Android 4.0+     |        okhttp 4+         |
 |  8.3.0        |  Android 5.0+     |        okhttp 4+         |
 |  8.2.x        |  Android 5.0+     |        okhttp 4+         |
 |  8.1.x        |  Android 5.0+     |        okhttp 4+         |

library/src/main/java/com/qiniu/android/http/dns/DnsPrefetcher.java

@@ -287,9 +287,6 @@ private void clearPreHosts(){
     private String[] getLocalPreHost(){
         ArrayList<String> localHosts = new ArrayList<>();
 
-//        String[] fixedHosts = getFixedZoneHosts();
-//        localHosts.addAll(Arrays.asList(fixedHosts));
-
         localHosts.add(Config.preQueryHost00);
         localHosts.add(Config.preQueryHost01);