Update install-release.sh

使用remove参数后，如果没有找到V2ray程序，则退出。

release/install-release.sh

@@ -284,6 +284,9 @@ remove(){
             colorEcho ${GREEN} "If necessary, please remove configuration file and log file manually."
             exit
         fi       
+    else
+        colorEcho ${GREEN} "V2Ray not found."
+        exit
     fi
 }