- fixes "unresolved import `winapi::um::fileapi`" errors for windows builds

- customize expected pretty-print output for windows platforms
  - work-around for debug print format changes between versions (see <rust-lang/rust#62794>)

- *serde* configuration attributes require MRV >= 1.18.0
  - introduced in commit 67f173d; "Optional serde serialization feature for colours and styles"
- `cargo test` now includes transitive dependencies which require MRV >= 1.28.0
- use of the `#[must_use]` configuration attribute causes compiler warnings
  - warnings appear for compilers >= 1.22.0 and < 1.28.0
  - introduced in commit afe5c93; "Mark Style::paint and Colour::paint as #[must_use]"

…espace

- use `CreateFileW` (usable in WinXP+) instead of `CreateFile2` (only usable in Win8+)

…ld badge)