v0.4.0

• Add status badges for CI validation, crates.io, and code coverage (#46)
• Remove self-signed end-entity cert support (#48)
• Add rustfmt toml to get edition 2018 formatting (#36)
• (MINOR) Update from_bytes(_async) to return a Result (#43)
• Adjust temp signer reserved sizes to account for large timestamps (#45)
• Fix bug in verify_from_buffer (#44)
• Remove cargo edit from publish workflow (#42)
• Apply fix from c2patool publish workflow (#40)
• Remove need for using OpenSSL to generate certs by using pre-generated certs (#41)
• Update README and pull request template with formatting changes (#38)