prepare v0.7.0 release

bump tokio-walltime to v0.1.2 for crates.io

update workflows

fix release ci bug

add support for more events (mfreeborn#18)

* add support for more events

* fix clippy lints

* create EventTime type

* bump version

* update README

* update cargo

* add new RuntimeErrorKind

* improve error handling

bump version

update release.yml

update travis

fix tags regex

bump cargo.lock