Update README.md

Changed logging in and out again to instead recommend sourcing the .bash_profile

Author: codr

install/centos/README.md

@@ -212,7 +212,7 @@ Make sure Git is in your `$PATH`:
 
     which git
 
-You might have to logout and login again for the `$PATH` to take effect.
+You might have to run `source ~/.bash_profile` for the `$PATH` to take effect.
 
 
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