v0.21.1
* update EventError with Is and Unwrap functions for use in errors API Signed-off-by: Daniel Rammer <daniel@union.ai> * changed EventError Is* functionality to check entire error stack Signed-off-by: Daniel Rammer <daniel@union.ai> * added nil tests to EventError.Is function Signed-off-by: Daniel Rammer <daniel@union.ai>