fix CHANGELOG style

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>

CHANGELOG.rst

@@ -7,35 +7,35 @@
 Changelog
 =========
 
-[1.0.4] - 2019-12-16
+1.0.4 - 2019-12-16
 ====================
 
 Fixed
 -----
 - fixes from checkpatch and coccicheck
 
-[1.0.3] - 2019-10-08
+1.0.3 - 2019-10-08
 ====================
 
 Added
 -----
 - parent repo (coht at CERN) version
 
-[1.0.2] - 2019-10-08
+1.0.2 - 2019-10-08
 ====================
 
 Changed
 -------
 - project REUSE compliant
 
-[1.0.1] - 2019-10-07
+1.0.1 - 2019-10-07
 ====================
 
 Added
 -----
 - gitlab CI with automatic RPM deployment on CERN koji
 
-[1.0.0] - 2019-09-26
+1.0.0 - 2019-09-26
 ====================
 
 Changes
@@ -43,7 +43,7 @@ Changes
 - better ``printk()`` output
 - better use of ``memcpy()``
 
-[0.9.1] - 2019-09-09
+0.9.1 - 2019-09-09
 ====================
 
 Added