Bump proptest from 0.8.7 to 1.0.0

[dependabot-preview[bot]]

Bumps proptest from 0.8.7 to 1.0.0.

Commits

• 1ad340e Merge branch '1.0.0-changes'
• 1cb1c60 wasm32-unknown-unknown is no longer supported out-of-the-box.
• 08e6113 Proptest version 1.0.0, -derive version 0.3.0.
• e26df9f Remove obsolete [badges] sections.
• 343b9ee Update appveyor config to newer appveyor-rust scheme.
• 679960d Remove appveyor tests for 32-bit Windows.
• 2e2d6a9 Bump appveyor rust version to 1.50.0.
• 4a79cd2 Regenerate readme.
• 12eb414 rustfmt
• 5ca5caf Fix unstable feature.
• Additional commits viewable in compare view

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