Start SPIRV-Tools v2022.5

CHANGES

diff --git a/CHANGES b/CHANGES
index 56a2d52..384805c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,8 @@
 Revision history for SPIRV-Tools
 
+v2022.5-dev 2022-10-12
+   - Start v2022.5-dev
+
 v2022.4 2022-10-12
   - General
     - Support Narrow Types in BitCast Folding Rule (#4941)