Update pretty_assertions requirement from 0.7.2 to 1.0.0 (#26)

Updates the requirements on [pretty_assertions](https://github.com/colin-kiegel/rust-pretty-assertions) to permit the latest version.
- [Release notes](https://github.com/colin-kiegel/rust-pretty-assertions/releases)
- [Changelog](https://github.com/colin-kiegel/rust-pretty-assertions/blob/main/CHANGELOG.md)
- [Commits](rust-pretty-assertions/rust-pretty-assertions@v0.7.2...v1.0.0)

---
updated-dependencies:
- dependency-name: pretty_assertions
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -27,7 +27,7 @@ lazy_static = "1.4"
 
 [dev-dependencies]
 indoc = "1.0"
-pretty_assertions = "0.7.2"
+pretty_assertions = "1.0.0"
 
 [lib]
 name = "dockerfile_parser"