Add CHANGELOG

Author: andrewkroh

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.1.0] - 2019-04-10
+
+### Added
+- Added go.mod file. #10
+- Added new syscalls to be in sync with Linux v5.0. #11
+
+### Fixed
+- Fixed integer overflow in BPF conditional jumps when using long lists of
+  syscalls (>256). #9
+
+## [1.0.0] - 2018-05-17
+
+### Added
+- Initial release.
+
+[Unreleased]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/elastic/go-seccomp-bpf/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/elastic/go-seccomp-bpf/v1.0.0