Update to 3.01
    
    - New upstream release 3.01
      - Support for openssl SHA-256 key derivation algorithm
      - Add support for PBKDF2 key derivation algorithm
        - New dependencies: Digest::SHA, Crypt::PBKDF2, Crypt::Cipher::AES
      - Add support for OFB, CFB and CTR chain modes
        - New dependency: Math::BigInt
      - Added better argument checking
      - Fixed long-standing standard padding bug: plaintext ending with bytes
        between 0x00 and 0x0A would be truncated in some conditions
      - Fixed Rijndael_compat padding
      - Warn when the deprecated opensslv1 PBKDF (key derivation function) is used
        for encryption; turn off with -nodeprecate=>1 or by choosing a different
        PBKDF, such as -pbkdf=>'pbkdf2'
      - Fix a regression when passing the legacy -salt=>1 argument
      - Released version 3.01 in recognition of multiple new features and clean-ups