Release v1.1.2

v1.1.0

This release introduces support for 1.18 as the
minimum version. This is an important release as
it removes the need to type assert when using the
TTL cache implementation with the support of
Go's new generics implementation.

This is likely to break cases where the TTL cache
is used but type inferrence does not work which
has prompted a v1.1.0 release rather than a v1.0.0
release.

Removing microsecond test because it continues to fail