[Present implementation](https://github.com/znc/znc/blob/396bdb1ebafaf88ec1c72d89b174d3d1c2f23352/src/Utils.cpp#L480-509) assumes a `key=value` type tag, but a `key` only type tag is [also valid](http://ircv3.atheme.org/specification/message-tags-3.2).
The [accompanying tests](https://github.com/znc/znc/blob/5237e89bc318355bdae02a3672ee89e31dc0ff9e/test/UtilsTest.cpp) should also be updated.
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Present implementation assumes a
key=valuetype tag, but akeyonly type tag is also valid.The accompanying tests should also be updated.
Also the last spec now defines escaping of values