Add release notes

Signed-off-by: Eric Biggers <ebiggers@google.com>
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+# fsverity-utils release notes
+
+## Version 1.1
+
+* Split the file measurement computation and signing functionality
+  of the `fsverity` program into a library `libfsverity`.  See
+  `README.md` and `Makefile` for more details.
+
+* Improved the Makefile.
+
+* Added some tests.  They can be run using `make check`.  Also added
+  `scripts/run-tests.sh` which does more extensive prerelease tests.
+
+* Lots of cleanups and other small improvements.
+
+## Version 1.0
+
+* First official release of fsverity-utils.