Update NEWS, bump version to 1.21.

Signed-off-by: Petri Latvala <petri.latvala@intel.com>
Acked-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
diff --git a/meson.build b/meson.build
index 3640335..5f12653 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('intel-gpu-tools', 'c',
-	version : '1.20',
+	version : '1.21',
         default_options: [
           'warning_level=2',
           'c_std=gnu99',