cbor-codec 0.3.0

CBOR Codec implementation
0.3.0
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- Fix `Decoder::{i8,i16,i32,i64}` to support positive values (#7).
- Handle (signed) integer overflows.
- Add `Int` and `Decoder::int` to support negative integer decoding
  without overflows.
- Expose `Kernel` in `Decoder` (#4).
- Expose writer in `Encoder` (#6).

0.2.0
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- Add `Decoder::skip` method (see issue #3 for details).

0.1.1
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- Workaround unstable features.
  For now this requires `libc` as an additional dependency.

0.1.0
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- Initial release