all: Update CHANGELOG for v0.9.1

Signed-off-by: Matthew Heon <[email protected]>

CHANGELOG

@@ -2,5 +2,16 @@ libseccomp-golang: Releases
 ===============================================================================
 https://github.com/seccomp/libseccomp-golang
 
+* Version 0.9.1 - May 21, 2019
+- Minimum supported version of libseccomp bumped to v2.2.0
+- Use Libseccomp's `seccomp_version` API to retrieve library version
+- Unconditionally set TSync attribute for filters, due to Go's heavily threaded nature
+- Fix CVE-2017-18367 - Multiple syscall arguments were incorrectly combined with logical-OR, instead of logical-AND
+- Fix a failure to build on Debian-based distributions due to CGo code
+- Fix unit test failures on 32-bit architectures
+- Improve several errors to be more verbose about their causes
+- Add support for SCMP_ACT_LOG (with libseccomp versions 2.4.x and higher), permitting syscalls but logging their execution
+- Add support for SCMP_FLTATR_CTL_LOG (with libseccomp versions 2.4.x and higher), logging not-allowed actions when they are denied
+
 * Version 0.9.0 - January 5, 2017
 - Initial tagged release