Update yew requirement from 0.14.0 to 0.15.0

[dependabot-preview]

Updates the requirements on yew to permit the latest version.

Release notes

Sourced from yew's releases.

v0.15.0

Attention!

yew now uses web-sys by default. If your project uses web-sys, you can now drop the "web_sys" feature from your yew dependency. Don't worry stdweb users, we have created a new alias crate for y'all called yew-stdweb. In order to use it, update your Cargo.toml yew dependency to the following:

yew = { version = "0.15", package = "yew-stdweb" }

Dev Survey Results

Thank you to everyone that took the time to fill out the Yew Dev Survey! 🙇‍♂️

Results have been posted here: https://github.com/yewstack/yew/wiki/Dev-Survey-%5BSpring-2020%5D

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Changelog

• ⚡️ Features

  • Add support for single use callbacks (useful for TimeoutService). [[@lukerandall], #1125]
  • Updated scheduler to eagerly destroy components to avoid unnecessary renders. [[@jstarry], #1072]
  • Add support key attribute to improve rendering performance. [[@mrh0057], #1076]

• 🛠 Fixes

  • Split class names on whitespace when passed within tuple or Vec. [@bryanjswift, #1084]

• 🚨 Breaking changes

  • The components module has been moved out yew and into yew-components. [[@jstarry], #1132]
  • Replaced mounted component lifecycle method with rendered which is called after each render. [[@jstarry], #1072]
  • Components must now implement the change method (forgetting this was a very common issue). [[@jstarry], #1071]
  • Yew now builds with web-sys by default. [[@jstarry], #1092]

... (truncated)

Commits

• 6498a46 Prep v0.15 release
• 8cda60d Move components out of core crate (#1132)
• 037d18c Remove old cargo file (#1130)
• f627563 Add mergify rules (#1131)
• f9a783c Upstream yewtil crate (#1119)
• a91e7f6 Replace mounted with rendered lifecycle method (#1072)
• d799368 Convert Callback to be an enum to support Fn and FnOnce. (#1125)
• 3b669fa Make examples compile with wasm-pack (#1124)
• 5491bf9 Update to Rust v1.43.0 (#1123)
• 9f286d1 Upstream yew-router project (#1095)
• Additional commits viewable in compare view

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