Fixing CHANGELOG link

Markdown habits die hard. I don’t know if I’ll ever get used to using RST for Python projects.

Signed-off-by: Geoffrey Wiseman <geoffrey.wiseman@codiform.com>

README.rst

@@ -10,7 +10,9 @@ A small tool to make it pretty simple to add and remove ip addresses (or CIDR bl
 security group. This acts like a sort of oversimplified VPN, where you can quickly give yourself
 SSH access to a project as you move about from network to network.
 
-You can read about recent changes in the [CHANGELOG](CHANGELOG.md).
+You can read about recent changes in the CHANGELOG_.
+
+.. _CHANGELOG: CHANGELOG.md
 
 Better Solutions
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