update README

README.md

@@ -11,11 +11,9 @@
 git clone https://git.yishihui.com/VideoProcessing/PQCVMedia.git
 
 cd PQCVMedia
-mkdir build && cd build
 
-cmake -DCMAKE_BUILD_TYPE=Release ..
+./build.sh
 
-make -j8 && make install
 echo "安装成功，在当前 output/lib 下"
 
 ```