Merge pull request #798 from athompso/athompso-patch-1

Update download_linux.html.erb

Author: peff

app/views/downloads/download_linux.html.erb

@@ -32,5 +32,8 @@
 
   <h3>OpenBSD</h3>
   <code>$ pkg_add git</code>
+  
+  <h3>Red Hat Enterprise Linux, Oracle Linux, CentOS, Scientific Linux, et al.</h3>
+  <p>RHEL and derivatives typically ship older versions of git.  If you cannot (or don't want to) compile git from source, you may need to use a 3rd-party repository such as <a href="https://ius.io/">the IUS Community Project</a> to obtain a more recent version of git.</p>
 
 </div>