Update metamodel valid_from requirements

Author: antonkri

src/extensions/score_metamodel/metamodel.yaml

@@ -263,14 +263,16 @@ needs_types:
       rationale: ^.+$
       # req-Id: tool_req__docs_common_attr_security
       security: ^(YES|NO)$
+      # req-Id: tool_req__docs_req_attr_validity_correctness
+      valid_from: ^v(0|[1-9]\d*)\.(0|[1-9]\d*)(\.(0|[1-9]\d*))?$
     optional_options:
       # req-Id: tool_req__docs_req_attr_reqcov
       reqcovered: ^(YES|NO)$
       # req-Id: tool_req__docs_req_attr_testcov
       testcovered: ^(YES|NO)$
       hash: ^.*$
       # req-Id: tool_req__docs_req_attr_validity_correctness
-      valid_from: ^v(0|[1-9]\d*)\.(0|[1-9]\d*)(\.(0|[1-9]\d*))?$
+      # valid_from: ^v(0|[1-9]\d*)\.(0|[1-9]\d*)(\.(0|[1-9]\d*))?$
       valid_until: ^v(0|[1-9]\d*)\.(0|[1-9]\d*)(\.(0|[1-9]\d*))?$
     tags:
       - requirement