* Update dependencies

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Update

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Revert some deps; Fix some warnings

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Improve utils of derive

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Bump bitvec to 0.15

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Improve utils of derive

Signed-off-by: koushiro <koushiro.cqx@gmail.com>

* Add `EncodeLike`

* Some stuff

* Make it work

* Review feedback

* Add example

* Update README

* Add bound

* fix io reader

* Revert "Implement min_encoded_len and required_len (#119)"

This reverts commit 2b66d2ce.