Improve formatting of CHANGELOG.md

Author: Jonathan Wright

CHANGELOG.md

@@ -1,11 +1,15 @@
+# Changelog
+
 ## 1.2.0 (2016.08.29)
 
-NOTES:
+### NOTES
+
 Add support for DNSSEC processing, improve logic around `DOMAIN` and
 `DOMAIN-SEARCH` handling, add support for `DOMAIN-ROUTE`, and improve
 documentation.
 
-BACKWARDS INCOMPATIBILITIES:
+### BACKWARDS INCOMPATIBILITIES
+
 - Due to (probably) an incorrect assumption on my part (@jonathanio) in the
   purpose of `DOMAIN-SEARCH` verses `DOMAIN`, domains added via `DOMAIN` were
   marked as searchable, and so would be appended to bare domain names, while
@@ -17,61 +21,53 @@ BACKWARDS INCOMPATIBILITIES:
   (hopefully) properly handles `DOMAIN` and `DOMAIN-SEARCH` (single of the
   former, and is primary, multiple of the latter and secondary).
 
-FEATURES:
+### FEATURES
+
 - Add support for `DNSSEC` option which allows you to enable or disable (or
   leave to system default) the `DNSSEC` setting for any DNS queries made to the
   DNS servers provided for this link. (@jonathanio)
 - Add support for `DOMAIN-ROUTE` which, through `systemd-resolved`, allows you
   to set domain names which should be routed over this link to the DNS servers
   provided. (@jonathanio)
 
-IMPROVEMENTS:
+### IMPROVEMENTS
+
 - Correct the logic around the handling of `DOMAIN` and `DOMAIN-SEARCH` to be
   more compatible with previous versions of these handlers. (@jonathanio)
 
-BUG FIXES:
-- None.
-
 ## 1.1.1 (2016.08.10)
 
-NOTES:
+### NOTES
+
 Thanks to the help from @pid1 for this release. The documentation mistakenly
 noted to use pre-down for the script now (compared to down originally, which
 failed as the tun or tap device would have been removed before the script
 ran). However, this should have in fact been down-pre.
 
-FEATURES:
-- None.
-
-IMPROVEMENTS:
-- None.
+### BUG FIXES
 
-BUG FIXES:
 - Fix `pre-down` to `down-pre` in the documentation else you'll break your
   OpenVPN configuration. (@pid1)
 
 ## 1.1.0 (2016.08.08)
 
-NOTES:
+### NOTES
+
 Thanks to the work by @BaxterStockman, the script has been refactored, hopefully
 making it easier to read and follow, while additional tests around IPv6
 processing have been added.
 
-FEATURES:
-- None.
+### IMPROVEMENTS
 
-IMPROVEMENTS:
 - Refactor the codebase to make it easier to read and expand. (@BaxterStockman)
 - Improve run-tests so multiple tests can be run within a file, and can expect
   failures within a test. (@BaxterStockman)
 - Add tests for invalid IPv6 addresses. (@BaxterStockman)
 
-BUG FIXES:
-- None.
-
 ## 1.0.0 (2016.06.23)
 
-NOTES:
+### NOTES
+
 First release of `update-systemd-resolved`. Should fully support the three
 standard DHCP options in OpenVPN (`DNS`, `DOMAIN`, and `DOMAIN-SEARCH`) with
 integration tests around the code to manage and monitor regressions. Also