update task/generate-odcs-compose/0.2/MIGRATION.md

task/generate-odcs-compose/0.2/MIGRATION.md

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+# Migration from 0.1 to 0.2
+The default values for `COMPOSE_INPUTS` and `COMPOSE_OUTPUTS` parameters was changed.
+
+## Action from users
+If you were using the default value for those parameters, you should manually set them
+to their previous defaults before upgrading in order to retain the same behavior.
+
+Consult the table below for the old and updated defaults:
+
+| Parameter Name  | Old Default         | New Default                   |
+| ---             | ---                 | ---                           |
+| COMPOSE_INPUTS  | compose_inputs.yaml | source/compose_inputs.yaml    |
+| COMPOSE_OUTPUTS | repos               | fetched.repos.d               |