Update index.md

Add Change Proposal 38 and its ref to Google Docs

Author: plbt5

releases/0.2.1/index.md

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 *Date: TBD*
+
+## Ontology File(s)
+
+[GitHub](https://github.com/casework/CASE/releases/tag/0.2.1)
+
+## Migration guidance
+
+In terms of CASE-namespaced concepts, release 0.2.1 is a patch to 0.2.0.  Migration from CASE 0.2.0 does not require alterations to existing data.  
+
+## Release Notes
+
+### Focus
+
+The focus of this patch is on IRI's:
+* slash based as opposed to #-based IRI's
+
+
+### Changes
+
+*(These are changes to ontologies, classes or properties in the preexisting ontology.)*
+
+Throughout this section, many of the notes are tied to Change Proposals.  These proposals are available on CASE's [Reference Material page](/resources/references.html).
+
+#### Development Changes
+
+*(These are changes to ontology development practice, and are not necessarily changes to ontology data.)*
+
+* None
+
+#### Breaking Changes
+
+*(These are changes to ontologies, classes or properties in the preexisting ontology that make the new release non-backward-compatible.)*
+
+* None
+
+
+#### Changes
+
+*(These are general changes to the preexisting ontology that are not breaking or range changes.)*
+
+* rdf-toolkit base-iri flag degenerates versionIRI when slash IRI form is used
+  *([Change Proposal 38](https://drive.google.com/file/d/1T7ZmDZuslKAGc2HA3PPYhSmKqDDoqfkt/view))* 
+