Convert `changelog` to markdown format

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

(cherry picked from commit 4a08984a)

changelog

--*-changelog-*-
-
-2.7.0.0  Nov 2013
-
-        * New `forkProcessWithUnmask` function in the style of `forkIOWithUnmask`
-
-        * Change `forkProcess` to inherit the exception masking state of its caller
-
-        * Add new `Bool` flag to `ProcessStatus(Terminated)` constructor
-        indicating whether a core dump occured
-
-        * New functions in "System.Posix.Files(.ByteString)" for operating
-        on high resolution file timestamps:
-
-         + `setFdTimesHiRes :: Fd -> POSIXTime -> POSIXTime -> IO ()`
-         + `setFileTimesHiRes :: FilePath -> POSIXTime -> POSIXTime -> IO ()`
-         + `setSymbolicLinkTimesHiRes :: FilePath -> POSIXTime -> POSIXTime -> IO ()`
-         + `touchFd :: Fd -> IO ()`
-         + `touchSymbolicLink :: FilePath -> IO ()`
-
-        * Export `SignalInfo(..)` and `SignalSpecificInfo(..)` as well as
-        the two `Handler` constructors `CatchInfo` and `CatchInfoOnce`
-        from "System.Posix.Signals".
-
-        * Don't export `seekDirStream` and `tellDirStream` if the
-        underlying `seekdir(3)`/`telldir(3)` system calls are not
-        available (as on Android).
-
-        * Fix library detection of `shm*` on openSUSE (#8350)
-
-        * Minor documentation fixes/updates
-
-        * Update package to `cabal-version >= 1.10` format
-
-2.6.0.1  Jan 2013
-
-        * Bundled with GHC 7.6.2
-        * Fix memory corruption issue in `putEnv`
-        * Use `pthread_kill(3)` instead of `raise(2)` on OS X too
-
-2.6.0.0  Sep 2012
-
-        * Bundled with GHC 7.6.1
-        * New functions `mkdtemp` and `mkstemps` in "System.Posix.Temp"
-        * New functions `setEnvironment` and `cleanEnv`
-        * New functions `accessTimeHiRes`, `modificationTimeHiRes`, and
-        `statusChangeTimeHiRes` for accessing high resolution timestamps

changelog.md

+## 2.7.0.0  *Nov 2013*
+
+  * New `forkProcessWithUnmask` function in the style of `forkIOWithUnmask`
+
+  * Change `forkProcess` to inherit the exception masking state of its caller
+
+  * Add new `Bool` flag to `ProcessStatus(Terminated)` constructor
+    indicating whether a core dump occured
+
+  * New functions in `System.Posix.Files{,.ByteString}` for operating
+    on high resolution file timestamps:
+
+        setFdTimesHiRes :: Fd -> POSIXTime -> POSIXTime -> IO ()
+        setFileTimesHiRes :: FilePath -> POSIXTime -> POSIXTime -> IO ()
+        setSymbolicLinkTimesHiRes :: FilePath -> POSIXTime -> POSIXTime -> IO ()
+        touchFd :: Fd -> IO ()
+        touchSymbolicLink :: FilePath -> IO ()
+
+  * Export `SignalInfo(..)` and `SignalSpecificInfo(..)` as well as
+    the two `Handler` constructors `CatchInfo` and `CatchInfoOnce`
+    from `System.Posix.Signals`
+
+  * Don't export `seekDirStream` and `tellDirStream` if the underlying
+    `seekdir(3)`/`telldir(3)` system calls are not available (as on Android)
+
+  * Fix library detection of `shm*` on openSUSE (#8350)
+
+  * Minor documentation fixes/updates
+
+  * Update package to `cabal-version >= 1.10` format
+
+## 2.6.0.1  *Jan 2013*
+
+  * Bundled with GHC 7.6.2
+  * Fix memory corruption issue in `putEnv`
+  * Use `pthread_kill(3)` instead of `raise(2)` on OS X too
+
+## 2.6.0.0  *Sep 2012*
+
+  * Bundled with GHC 7.6.1
+  * New functions `mkdtemp` and `mkstemps` in `System.Posix.Temp`
+  * New functions `setEnvironment` and `cleanEnv`
+  * New functions `accessTimeHiRes`, `modificationTimeHiRes`, and
+    `statusChangeTimeHiRes` for accessing high resolution timestamps

unix.cabal

 name:           unix
-version:        2.7.0.0
+version:        2.7.0.1
 -- GHC 7.6.1 released with 2.6.0.0
 license:        BSD3
 license-file:   LICENSE
@@ -19,7 +19,7 @@ description:
     The package is not supported under Windows (except under Cygwin).
 
 extra-source-files:
-    changelog
+    changelog.md
     config.guess
     config.sub
     configure