Fixed typo

Author: Wachiwi

install/centos/README.md

@@ -190,11 +190,11 @@ Remove the old Ruby 1.8 if present:
 Download Ruby and compile it:
 
     mkdir /tmp/ruby && cd /tmp/ruby
-    curl --progress ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p353.tar.gz | tar xz
-    cd ruby-2.0.0-p353
+    curl --progress ftp://ftp.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz | tar xz
+    cd ruby-2.1.0
     ./configure --disable-install-rdoc
     make
-    make install
+    make prefix=/usr/local install
 
 Install the Bundler Gem:
 
@@ -579,4 +579,4 @@ nobody can access your GitLab by using this login information later on.
 [SDL]: https://puias.math.ias.edu
 [PU]: http://www.princeton.edu/
 [IAS]: http://www.ias.edu/
-[keys]: https://fedoraproject.org/keys
+[keys]: https://fedoraproject.org/keys