Remove webtatic repo reference for CentOS5

* The repo is down and Git is included in default repo of newer versions of CentOS
[ci skip]

README.md

@@ -65,10 +65,7 @@ relevant to your Operation System, please refer to the Wiki (links at the end of
 	* Type:
 		* (For CentOS)
 
-				yum install gcc make mysql mysql-devel mysql-server pcre-devel zlib-devel
-				rpm -Uvhhttp://repo.webtatic.com/yum/centos/5/latest.rpm
-				yum install --enablerepo=webtatic git-all
-				yum install --enablerepo=webtatic --disableexcludes=main git-all
+				yum install gcc make mysql mysql-devel mysql-server pcre-devel zlib-devel git
 		* (For Debian)
 
 				apt-get install git make gcc libmysqlclient-dev zlib1g-dev libpcre3-dev

README.txt

@@ -77,10 +77,7 @@ Windows
 Linux
 	* Type:
 	(For CentOS)
-		yum install gcc make mysql mysql-devel mysql-server pcre-devel zlib-devel
-		rpm -Uvhhttp://repo.webtatic.com/yum/centos/5/latest.rpm
-		yum install --enablerepo=webtatic git-all
-		yum install --enablerepo=webtatic --disableexcludes=main git-all
+		yum install gcc make mysql mysql-devel mysql-server pcre-devel zlib-devel git
 	(For Debian)
 		apt-get install git make gcc libmysqlclient-dev zlib1g-dev libpcre3-dev
 	* Type: