[README] Update the install script.

Signed-off-by: YiYing He <yiying@secondstate.io>

Author: q82419

README.md

@@ -24,17 +24,17 @@ Developers should install the [OpenVINO] first before build and run WasmEdge wit
 For this project, we use the version `2021.4.582`. Please refer to the [installation script](scripts/install_openvino.sh).
 
 ```bash
-curl -sSL https://apt.repos.intel.com/openvino/2021/GPG-PUB-KEY-INTEL-OPENVINO-2021 | gpg --dearmor > /usr/share/keyrings/GPG-PUB-KEY-INTEL-OPENVINO-2021.gpg
-echo "deb [signed-by=/usr/share/keyrings/GPG-PUB-KEY-INTEL-OPENVINO-2021.gpg] https://apt.repos.intel.com/openvino/2021 all main" | tee /etc/apt/sources.list.d/intel-openvino-2021.list
-apt update
-apt install -y intel-openvino-runtime-ubuntu20-2021.4.582
+curl -sSL https://apt.repos.intel.com/openvino/2021/GPG-PUB-KEY-INTEL-OPENVINO-2021 | sudo gpg --dearmor > /usr/share/keyrings/GPG-PUB-KEY-INTEL-OPENVINO-2021.gpg
+echo "deb [signed-by=/usr/share/keyrings/GPG-PUB-KEY-INTEL-OPENVINO-2021.gpg] https://apt.repos.intel.com/openvino/2021 all main" | sudo tee /etc/apt/sources.list.d/intel-openvino-2021.list
+sudo apt update
+sudo apt install -y intel-openvino-runtime-ubuntu20-2021.4.582
 ```
 
 After the installation, you may need to add the path:
 
 ```bash
 source /opt/intel/openvino_2021/bin/setupvars.sh
-ldconfig
+sudo ldconfig
 ```
 
 [OpenVINO]: https://www.intel.com/content/www/us/en/developer/tools/openvino-toolkit/overview.html