docs(marshal): Update NEWS.md
MODIFY
packages/marshal/NEWS.md
packages/marshal/NEWS.md
User-visible changes in `@endo/marshal`:
+# v0.5.1 (2021-01-22)
+
+Moved from https://github.com/Agoric/agoric-sdk to
+https://github.com/endojs/endo, still in a `packages/marshal` directory.
+
+
+---
+
# v0.1.2 (2019-12-17)
- depend on @agoric/eventual-send (#6)

docs(marshal): Update NEWS.md