Update to yew 0.19

[dcchut]

Notes:

• Running cargo +nightly fmt generated a lot of whitespace changes in html!() calls, which is unfortunate.
• Cow<'static, str> replaced with Option<AttrValue> since IntoPropValue is not implemented on Cow anymore.
• InputData was removed from yew. I've made some (presumably quite dodgy) changes to handle this - this is probably worth having a closer look at.

Resolves #15

[ranile]

Thanks for this PR! I don't think this crate was ever going to be updated if not for you doing it.

It would be great if you could also update mwc. All you have to do is update the npm package, invoke rollup and accommodate for breaking changes as described in the changelog. That can be a separate PR. I'll go ahead and merge this one.

[jens1205]

This PR is not yet available on crates.io? There I can only see 0.1.0

[ranile]

Yes, it hasn't yet been published. If you want to use it, you need to use a git dependency:

material-yew = { git = "https://github.com/hamza1311/material-yew/", features = ["full"] }

[jens1205]

Thanks for the immediate response. yes, git dependency is working (first time I used this, so thanks for the opportunity :-))

Is anything preventing the official publishing of the new version?

[ranile]

Hi, sorry for the very late response. I've published a new version.

cc @jens1205