change version info

Author: YangSen-qn

CHANGELOG.md

@@ -1,5 +1,9 @@
 #Changelog
 
+## 7.4.3 (2020-07-27)
+## 优化
+优化Dns预取的缓存方案
+
 ## 7.4.2 (2020-07-15)
 ## 修正
 修改版本依赖：HappyDns -> 0.3.17

Qiniu.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'Qiniu'
-  s.version      = '7.4.2'
+  s.version      = '7.4.3'
   s.summary      = 'Qiniu Resource Storage SDK for iOS and Mac'
   s.homepage     = 'https://github.com/qiniu/objc-sdk'
   s.social_media_url = 'http://weibo.com/qiniutek'

QiniuSDK/Utils/QNVersion.h

@@ -11,4 +11,4 @@
 /**
  *    sdk 版本
  */
-static NSString *const kQiniuVersion = @"7.4.2";
+static NSString *const kQiniuVersion = @"7.4.3";