Update wasm-bindgen-test requirement from =0.2.48 to =0.3.2

[dependabot-preview]

Updates the requirements on wasm-bindgen-test to permit the latest version.

Changelog

Sourced from wasm-bindgen-test's changelog.

wasm-bindgen Change Log

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0.2.52

Released 2019-10-24.

Added

• The support for wasm-interface-types now uses multi-value by default.
  #1805

• The Worklet IDL has been updated.
  #1817

• The HTMLInputElement type has selectionStart and selectionEnd properties now.
  #1811

• An unintern function has been added to remove an interned string from the
  cache.
  #1828

Changed

• Some WebIDL indexing getters have been corrected to reflect that they can
  throw and/or return undefined
  #1789

Fixed

• A bug with TextDecoder and Safari has been fxied
  #1789

---

0.2.51

Released 2019-09-26.

Added

• The wasm-bindgen-futures and wasm-bindgen-test crates now require Nightly
  Rust and have a new major version published as a result. These crates now
  support async/await by default, and they will be supported in the stable
  Rust 1.39.0 release. The previous versions of crates will continue to work on
  stable today.
  #1741

• Using #[wasm_bindgen] on an async function will now work and return a

... (truncated)

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