Update README.md

Author: nihui

README.md

@@ -33,33 +33,33 @@
 
 (armeabi-v7a arm64-v8a x86 x86_64) build with ndk r21d and android api 24
 
-* [opencv-mobile-2.4.13.7-android.zip (7.77MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-2.4.13.7-android.zip)
-* [opencv-mobile-3.4.13-android.zip (14.9MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-3.4.13-android.zip)
-* [opencv-mobile-4.5.1-android.zip (15.5MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-4.5.1-android.zip)
+* [opencv-mobile-2.4.13.7-android.zip (7.77MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-2.4.13.7-android.zip)
+* [opencv-mobile-3.4.13-android.zip (14.9MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-3.4.13-android.zip)
+* [opencv-mobile-4.5.1-android.zip (15.5MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-4.5.1-android.zip)
 
 ## iOS
 
 (armv7 arm64 arm64e i386 x86_64) build with Xcode 12.2
 
-* [opencv-mobile-2.4.13.7-ios.zip (9.81MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-2.4.13.7-ios.zip)
-* [opencv-mobile-3.4.13-ios.zip (14.3MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-3.4.13-ios.zip)
-* [opencv-mobile-4.5.1-ios.zip (14.8MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-4.5.1-ios.zip)
+* [opencv-mobile-2.4.13.7-ios.zip (9.8MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-2.4.13.7-ios.zip)
+* [opencv-mobile-3.4.13-ios.zip (14.3MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-3.4.13-ios.zip)
+* [opencv-mobile-4.5.1-ios.zip (14.8MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-4.5.1-ios.zip)
 
 ## iOS with bitcode
 
 (armv7 arm64 arm64e i386 x86_64) build with Xcode 12.2
 
-* [opencv-mobile-2.4.13.7-ios-bitcode.zip (35.2MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-2.4.13.7-ios-bitcode.zip)
-* [opencv-mobile-3.4.13-ios-bitcode.zip (49.5MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-3.4.13-ios-bitcode.zip)
-* [opencv-mobile-4.5.1-ios-bitcode.zip (51.6MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-4.5.1-ios-bitcode.zip)
+* [opencv-mobile-2.4.13.7-ios-bitcode.zip (35.2MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-2.4.13.7-ios-bitcode.zip)
+* [opencv-mobile-3.4.13-ios-bitcode.zip (49.5MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-3.4.13-ios-bitcode.zip)
+* [opencv-mobile-4.5.1-ios-bitcode.zip (51.6MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-4.5.1-ios-bitcode.zip)
 
 ## ARM Linux
 
 (arm-linux-gnueabi arm-linux-gnueabihf aarch64-linux-gnu) build with ubuntu cross compiler
 
-* [opencv-mobile-2.4.13.7-armlinux.zip (7.97MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-2.4.13.7-armlinux.zip)
-* [opencv-mobile-3.4.13-armlinux.zip (14.1MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-3.4.13-armlinux.zip)
-* [opencv-mobile-4.5.1-armlinux.zip (14.6MB)](https://github.com/nihui/opencv-mobile/releases/download/v7/opencv-mobile-4.5.1-armlinux.zip)
+* [opencv-mobile-2.4.13.7-armlinux.zip (7.97MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-2.4.13.7-armlinux.zip)
+* [opencv-mobile-3.4.13-armlinux.zip (14.1MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-3.4.13-armlinux.zip)
+* [opencv-mobile-4.5.1-armlinux.zip (14.6MB)](https://github.com/nihui/opencv-mobile/releases/download/v8/opencv-mobile-4.5.1-armlinux.zip)
 
 # Usage Android