Update README.md

Author: sczhengyabin

README.md

@@ -32,12 +32,13 @@ pip3.exe install -r requirements.txt
 ### 3.2 Linux
 #### 3.2.1 Install dependent packages
 ```
-apt-get install python3-pip python3-pyqt4 pyqt4-dev-tools
+apt-get install python3-pip python3-pyqt5 pyqt5-dev-tools
 ```
 #### 3.2.2 Download and setup phantomjs
 + **For PC users**
 
 Official phantomjs prebuilt executable can be downloaded from [here](https://bitbucket.org/ariya/phantomjs/downloads)
+** [Warning]: PhantomJS installed from ubuntu source by apt-get do not work in this project. **
 + **For Raspberry Pi Users**
 
 Unofficial phantomjs prebuilt executable or .deb for raspberry pi can be downloaded from [here](https://github.com/fg2it/phantomjs-on-raspberry/releases)