git-packetline 0.10.1

A WIP crate of the gitoxide project implementing the pkt-line serialization format
Documentation 
### 0.10.0 (2021-08-27)

#### Breaking

* **renames / moves**
    - `immutable::PacketLine` -> `PacketLineRef`
    - `immutable::Error` -> `ErrorRef`
    - `immutable::Text` -> `TextRef`
    - `immutable::Band` -> `BandRef`
    - `immutable::DecodeBandError` -> `decode::band::Error`
    - `pub immutable::` -> `line::`
    - `pub write::` -> `write::`

* **removals**
   - `write::Writer` (is now only `Writer`)
   - `read::StreamingPeekableIter` (is now only `StreamingPeekableIter`)