doc: updated changelog

Signed-off-by: Nick Papior <[email protected]>

Author: zerothi

CHANGELOG

@@ -1,19 +1,27 @@
 0.9.9
 =====
 
-- Enabled VASP *CAR files to write/read dynamic specifications
+- Added a bilayer geometry which can create twisted bilayers #181, #186
+
+- Enabled VASP *CAR files to write/read dynamic specifications #185
 
 - Enabled xarray.DataArray returning from BrillouinZone objects #182
 
-- Several improvements to outSileSiesta.read_scf (thanks to Pol Febrer)
+- Several improvements to outSileSiesta.read_scf #174, #180
 
 - A huge performance increase for data extraction in tbtncSileTbtrans
 	(thanks to Gaetano Calogero for finding the bottleneck)
 
 - Added preliminary usage of Mixers, primarily intented for extending
 	sisl operations where SCF are used (may heavily change).
 
-- Now sisl is Python >=3.6 only
+- Now sisl is Python >=3.6 only, #162
+
+This release was helped by the following committers (THANKS):
+
+- Thomas Frederiksen
+- Pol Febrer
+- Jonas Lundholm Bertelsen
 
 0.9.8
 =====