update README

Author: debugly

README.md

@@ -143,7 +143,7 @@ If cloning repositories from GitHub is slow, or if you need to use an internal p
 | unibreak   | 6.1             | https://github.com/adah1972/libunibreak.git              | export GIT_UNIBREAK_UPSTREAM=git@xx:yy/libunibreak.git |
 | uavs3d     | 1.2.1           | https://github.com/uavs3/uavs3d.git                      | export GIT_UAVS3D_UPSTREAM=git@xx:yy/UAVS3D.git          |
 | xml2       | 2.13.6          | https://github.com/GNOME/libxml2.git                     | export GIT_FONTCONFIG_UPSTREAM=git@xx:yy/fontconfig.git  |
-| yuv        | stable-eb6e7bb  | https://github.com/debugly/libyuv.git                    | export GIT_YUV_UPSTREAM=git@xx:yy/yuv.git                |
+| yuv        | main-f94b8cf7  | https://github.com/debugly/libyuv.git                    | export GIT_YUV_UPSTREAM=git@xx:yy/yuv.git                |
 | webp       | v1.6.0 | https://github.com/debugly/libwebp.git | export GIT_WEBP_UPSTREAM=git@xx:yy/webp.git |
 
 ## Tips