Sipmsg v0.2.3

Fix User Agent parsing

Sipmsg v0.2.2

• Fix panic in GenericParam parser

Sipmsg v0.2

It was totally reworked compared to version 0.1.
This is still supported only the parsing.

Advantages:

• minimal dependecy list (nom, unicase)
• work in no_std Rust Environment.
• zero-copy
• 82% code coverage by unit tests
• KISS(keep it simple stupid) code style.

Parser for each RFC3261 header

Have done #5
And there are a lot of changes that I don't want to enumerate.
I don't recommend use versions lower than this.

Implement generic-param(rfc3261) parsing

Update nom to 6 version

Improve parsing of sip message headers

• Add support sip headers short names
• Split header container into RFC and extension containers
• Add SipRFCHeader enum type and from_str/to functions

Add long header fields support

0.1.5

Bump version of sipmsg to 0.1.5

Headers lookup by name is case insensitive

Add multiple headers support.
Add case insensitive headers lookup.
Change type presentation of message headers from vector to BTreeMap<Ascii<&str>, VecDeque<Header>>

Implement SipUri

Add SipUri to RequestLine