3.2.0

• Added Control::memory_limit (#7)
• Replaced ChildExt::with_timeout with ChildExt::controlled and Control::time_limit
• Replaced ChildExt::with_output_timeout with ChildExt::controlled_with_output and Control::time_limit
• Implemented From<Output> for ExitStatus
• Fixed possible stalling when termination of a timed-out process fails
• Fixed ExitStatus::code to always return positive values on Windows
  • This method previously returned the same values as process::ExitStatus::code on Windows, which uses the wrong sign for large values.
• Added support for time limits larger than WinAPI can accept
• Added the "rust-version" field to Cargo.toml
• Replaced winapi with windows-sys
• Increased the minimum supported Rust toolchain version to 1.54.0