README.md in fluent-plugin-geoip-0.8.1 vs README.md in fluent-plugin-geoip-0.8.2

@@ -14,10 +14,10 @@
 
 before use, install dependent library as:
 
 ```bash
 # for RHEL/CentOS
-$ sudo yum group install "Development Tools"
+$ sudo yum groupinstall "Development Tools"
 $ sudo yum install geoip-devel --enablerepo=epel
 $ sudo yum install libmaxminddb-devel --enablerepo=epel
 
 # for Ubuntu/Debian
 $ sudo apt-get install build-essential