v1.8.0

Fixed:

• Allow colons in event names: x-on:custom:event="..." (#65)
• Support for "space" keydown modifier: x-on:keydown.space="..." (#69)
• Class attribute bindings (for string and array syntax) weren't merging. Now, Alpine matches the behavior of VueJS (#75)
• Some reactivity issues have been fixed by a pretty major refactor of the core dependancy tracking mechanism (#74)