Update src/schema/README.md

Co-authored-by: Yaroslav Halchenko <[email protected]>

src/schema/README.md

@@ -511,4 +511,7 @@ changes": changes which would cause existing tools reading schema to
 adjust their code to be able to read it again.  Additions of new
 components to the schema should increment the last, `PATCH`, component
 of the version so that tools could selectively enable/disable loading
-specific components of the schema.
+specific components of the schema. With the release of `1.0.0` version of the schema, we expect that
+`MAJOR` component will be incremented whenever schema organization introduces "breaking
+changes", `MINOR` - when adding new components to the schema, and `PATCH` - when fixing
+errors in existing components.