Merge pull request #5299 from taosdata/docs/sangshuduo/TD-3114-refine-readme-centos-env

[TD-3114] <docs>: refine centos environment package list

README.md

@@ -57,9 +57,7 @@ sudo apt-get install -y  maven
 
 ### Centos 7:
 ```bash
-sudo yum install -y gcc gcc-c++ make cmake3 epel-release git
-sudo yum remove -y cmake
-sudo ln -s /usr/bin/cmake3 /usr/bin/cmake
+sudo yum install -y gcc gcc-c++ make cmake git
 ```
 
 To install openjdk-8: