changelog: update for 2.14.0-1

Signed-off-by: Peter Colberg <[email protected]>

Author: pcolberg

CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
+
+## [2.14.0-1]
+
+### Added
+
+- Support 256 bit data bus in PCIe SS model ([`5bc677d`](https://github.com/OFS/opae-sim/commit/5bc677d330c9d3e52d4c61144ce5be14a5675685)).
+- Enable PCIe tag renumbering when there is more than one VF ([`f74229f`](https://github.com/OFS/opae-sim/commit/f74229fe8b65b15291cfce9b8afb8baf284fbd26)).
+
+[2.14.0-1]: https://github.com/OFS/opae-sim/compare/2.13.0-2...2.14.0-1