Update README.md

Author: mr-c

README.md

@@ -1,7 +1,9 @@
 Hello!
 
-This repo holds the released v1.2 of the Common Workflow Language standard and the history of its development.
+This repo holds the development version of CWL v1.2.1; see https://github.com/common-workflow-language/cwl-v1.2/issues/54 for the plan.
+
+See https://github.com/common-workflow-language/cwl-v1.2/tree/v1.2.0 for the released v1.2 of the Common Workflow Language standards and the history of its development.
 
 You can render this using https://github.com/common-workflow-language/cwl-website/blob/master/website.sh
 
-You may browse the spec online at https://www.commonwl.org/v1.2
+You may browse the released v1.2 standards online at https://www.commonwl.org/v1.2