Update asn1crypto to 0.24.0

[pyup-bot]

There's a new version of asn1crypto available.
You are currently using 0.23.0. I have updated it to 0.24.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

0.24.0

• x509.Certificate().self_signed will no longer return "yes" under any
  circumstances. This helps prevent confusion since the library does not
  verify the signature. Instead a library like oscrypto should be used
  to confirm if a certificate is self-signed.
• Added various OIDs to x509.KeyPurposeId()
• Added x509.Certificate().private_key_usage_period_value
• Added structures for parsing common subject directory attributes for
  X.509 certificates, including x509.SubjectDirectoryAttribute()
• Added algos.AnyAlgorithmIdentifier() for situations where an
  algorithm identifier may contain a digest, signed digest or encryption
  algorithm OID
• Fixed a bug with x509.Certificate().subject_directory_attributes_value
  not returning the correct value
• Fixed a bug where explicitly-tagged fields in a core.Sequence() would
  not function properly when the field had a default value
• Fixed a bug with type checking in pem.armor()

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[coveralls]

Coverage remained the same at 30.471% when pulling e52c1b0 on pyup-update-asn1crypto-0.23.0-to-0.24.0 into 1803a07 on master.