v5 alpha - can't convert key to string

[ilrico]

First, had forwardEvent_js undefined, I understood that in addition to @pnofity/core and @pnotify/mobile, one have to install @smui/common... It's easy fix but not mentioned in docs. Should be included automatically in dependencies IMHO.

Other problem then when running Installation/Svelte exemple from docs, is "TypeError: can't convert e[p].key to string" and it relates to line 212 in core/index.svelte

[hperrin]

I'll fix the dependency issue. I'm not sure where the key to string issue is coming from.