update RELEASE_STEPS

Author: bratpiorka

RELEASE_STEPS.md

@@ -40,6 +40,7 @@ Do changes for a release:
 - Add an entry to ChangeLog, remember to change the day of the week in the release date
   - For major and minor (prior 1.0.0) releases mention API and ABI compatibility with the previous release
 - For major and minor releases, update `UMF_VERSION_CURRENT` in `include/umf/base.h` (the API version)
+  - For changes in ops structures, update corresponding UMF_*_OPS_VERSION_CURRENT
 - For major and minor (prior 1.0.0) releases update ABI version in `.map` and `.def` files
   - These files are defined for all public libraries (`libumf` and `proxy_lib`, at the moment)
 - Commit these changes and tag the release: