Bump wasm-bindgen from 0.2.21 to 0.2.23

[dependabot-preview]

Bumps wasm-bindgen from 0.2.21 to 0.2.23.

Changelog

Sourced from wasm-bindgen's changelog.

0.2.23

Released 2018-09-26.

Added

• This is the first release of the web-sys
  crate!

• Added support for unions of interfaces and non-interfaces in the WebIDL
  frontend.

• Added a policy for inclusion of new ECMAScript features in js-sys: the
  feature must be in stage 4 or greater for us to support it.

• Added some documentation about size profiling and optimization with
  wasm-bindgen to the guide.

• Added the Clamped<T> type for generating JavaScript Uint8ClampedArrays.

• CI is now running on beta! Can't wait for the rustc release trains to roll
  over, so we can run CI on stable too!

• Added the js_sys::try_iter function, which checks arbitrary JS values for
  compliance with the JS iteration protocol, and if they are iterable, converts
  them into an iterator over the JS values that they yield.

Changed

• We now only generate null checks on methods on the JS side when in debug
  mode. For safety we will always null check on the Rust side, however.

• Improved error messages when defining setters that don't start with set_ and
  don't use js_name = ....

• Improved generated code for classes in a way that avoids an unnecessary
  allocation with static methods that return Self but are not the "main"
  constructor.

• BREAKING: js_sys::Reflect APIs are all fallible now. This is because
  reflecting on Proxys whose trap handlers throw an exception can cause any of
  the reflection APIs to throw. Accordingly, js_sys has been bumped from
  0.2.X to 0.3.X.

Fixed

• The method of ensuring that __wbindgen_malloc and __wbindgen_free are
  always emitted in the .wasm binary, regardless of seeming reachability is
  now zero-overhead.

... (truncated)

Commits

• e0f4793 changelog: Note that this is the first web-sys release
• 4c766c5 Start web-sys at 0.3.0
• f834a42 Bump to version 0.2.23 (and js-sys and wasm-bindgen-futures to 0.3.0)
• 0ab03bb Merge pull request #888 from ctaggart/webpack-cli
• 052b41b update to "webpack-cli": "^3.1.1"
• ee0e4bc Merge pull request #887 from fitzgen/iterating-over-js-values
• a920656 guide: Update untyped JS values section to handle fallibility of Reflect::* APIs
• dfd0f53 guide: Add section about iterating over JS values
• 7db28b4 js-sys: run rustfmt
• f9cd329 js-sys: Add js_sys::try_iter for iterating over any JsValue
• Additional commits viewable in compare view

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