Convert changelog to markdown

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

changelog

--*- changelog -*-
-
-1.3.0.2  Nov 2013
-        * Update to Cabal 1.10 format
-        * Minor Haddock cleanups
-
-1.3.0.1  Sep 2012
-        * Bundled with GHC 7.6.1
-        * No changes
-
-1.3.0.0  Feb 2012
-        * Bundled with GHC 7.4.1
-        * Add support for SafeHaskell
-        * Fix `normalise` "/" to result in "/" rather than "/.".

changelog.md

+# Changelog for [`filepath` package](http://hackage.haskell.org/package/filepath)
+
+## 1.3.0.2  *Mar 2014*
+
+  * Bundled with GHC 7.8.1
+
+  * Update to Cabal 1.10 format
+
+  * Minor Haddock cleanups
+
+## 1.3.0.1  *Sep 2012*
+
+  * Bundled with GHC 7.6.1
+
+  * No changes
+
+## 1.3.0.0  *Feb 2012*
+
+  * Bundled with GHC 7.4.1
+
+  * Add support for SafeHaskell
+
+  * Fix `normalise "/"` to result in `"/"` rather than `"/."`

filepath.cabal

@@ -23,7 +23,7 @@ description:
 Extra-Source-Files:
     System/FilePath/Internal.hs
     README.md
-    changelog
+    changelog.md
 
 Library
     default-language: Haskell98