Start Shaderc v2026.4-dev

CHANGES

diff --git a/CHANGES b/CHANGES
index cb47656..150208d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,8 @@
 Revision history for Shaderc
 
+v2026.4-dev 2026-07-15
+ - Start v2026.4 development
+
 v2026.3 2026-07-15
  - Deprecate HLSL compilation.
      - Add build option SHADERC_ENABLE_HLSL to build Shaderc without