libaes 0.6.4

AES cipher in safe Rust with no dependencies
Documentation
# Version 0.6.4
- Enable cargo fmt check (#19)

# Version 0.6.3
- check input length in decrypt (#17)

# Verison 0.6.2
- add keyword and category (#15)

# Version 0.6.1
- Fix a typo

# Version 0.6.0
- Reverse API change in 0.5.0

# Version 0.5.0
- API change: return an error type for cbc_decrypt
- Update README

# Version 0.4.0

- Add support for CFB128 mode

# Version 0.3.0

- Add support for 192-bit keys

# Version 0.2.0

- Add support for 256-bit keys

# Version 0.1.2

- Add missing crates.io doc link

# Version 0.1.1

- Add missing fields in Cargo publish

# Version 0.1.0

- Initial version