Update base64 requirement from 0.11.0 to 0.12.0

[dependabot-preview]

Updates the requirements on base64 to permit the latest version.

Changelog

Sourced from base64's changelog.

0.12.0

• A Read implementation (DecoderReader) to let users transparently decoded data from a b64 input source
• IMAP's modified b64 alphabet
• Relaxed type restrictions to just AsRef<[ut8]> for main encode*/decode* functions
• A minor performance improvement in encoding

0.11.0

• Minimum rust version 1.34.0
• no_std is now supported via the two new features alloc and std.

0.10.1

• Minimum rust version 1.27.2
• Fix bug in streaming encoding (#90): if the underlying writer didn't write all the bytes given to it, the remaining bytes would not be retried later. See the docs on EncoderWriter::write.
• Make it configurable whether or not to return an error when decoding detects excess trailing bits.

0.10.0

• Remove line wrapping. Line wrapping was never a great conceptual fit in this library, and other features (streaming encoding, etc) either couldn't support it or could support only special cases of it with a great increase in complexity. Line wrapping has been pulled out into a line-wrap crate, so it's still available if you need it.
  • Base64Display creation no longer uses a Result because it can't fail, which means its helper methods for common configs that unwrap() for you are no longer needed
• Add a streaming encoder Write impl to transparently base64 as you write.
• Remove the remaining unsafe code.
• Remove whitespace stripping to simplify no_std support. No out of the box configs use it, and it's trivial to do yourself if needed: filter(|b| !b" \n\t\r\x0b\x0c".contains(b).
• Detect invalid trailing symbols when decoding and return an error rather than silently ignoring them.

0.9.3

• Update safemem

0.9.2

• Derive Clone for DecodeError.

0.9.1

• Add support for crypt(3)'s base64 variant.

0.9.0

• decode_config_slice function for no-allocation decoding, analogous to encode_config_slice
• Decode performance optimization

0.8.0

• encode_config_slice function for no-allocation encoding

0.7.0

... (truncated)

Commits

• 5e41403 v0.12.0
• e9c8f56 Update release notes for 0.12.0
• bfa7b90 Merge pull request #129 from marshallpierce/pull/97
• a6d49bc format
• 78e9461 Include new charset in random tests
• ffbeb87 Fix stray character in comment
• e0f0110 Merge branch 'master' into pull/97
• 5d3970e Merge pull request #122 from marshallpierce/nwalfield-streaming-reader
• 66bc806 format
• 0a020ee Add another test
• Additional commits viewable in compare view

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