release 0.9.4 (#803)

* release 0.9.4

Signed-off-by: Ke Xu <xuke@microsoft.com>

* update grammar

Signed-off-by: Ke Xu <xuke@microsoft.com>

CHANGES.md

@@ -24,6 +24,11 @@ this file to understand what changed.
 - bug fixes
 - other
 
+## v0.9.4
+
+- bug fixes
+  - fixed causal treatment policy display issue happening when switching between features
+
 ## v0.9.3
 
 - educational materials

version.cfg

@@ -1 +1 @@
-0.9.3
+0.9.4