Bump proptest from 1.1.0 to 1.4.0

[dependabot[bot]]

Bumps proptest from 1.1.0 to 1.4.0.

Commits

• 63ef67c [Release] 1.4.0 : adds missing changelog entries (#397)
• 3d40220 Merge pull request #393 from tzemanovic/tomas/compile-fail-must-be-debug
• a9123f3 Merge pull request #389 from proptest-rs/tomas/nightly-coroutine-trait
• 0a1ba01 fix :shrug:
• 5e17be7 fix nightly build (re: rust-lang/rust#116958)
• 6f534cb Merge pull request #377 from sameer/master
• d6f95d4 Update compiletest_rs requirement from 0.9 to 0.10 (#383)
• 8b06703 Update regex-syntax requirement from 0.7 to 0.8 (#386)
• f8c489d Update message-io requirement from 0.17.0 to 0.18.0 (#384)
• 539bd55 Enable Dependabot (#380)
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot merge` will merge this PR after your CI passes on it - `@dependabot squash and merge` will squash and merge this PR after your CI passes on it - `@dependabot cancel merge` will cancel a previously requested merge and block automerging - `@dependabot reopen` will reopen this PR if it is closed - `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually - `@dependabot show ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.