Tag names with dashes are not accepted by the parser

[meiao]

While going thru the increment demo, I tried to add a polymer webcomponent to the page.
The grammar seemed fine with it, but I got the following compilation error (macro panic).

error: proc macro panicked
  --> src/lib.rs:80:9
   |
80 | /         view! {
81 | |             <div>
82 | |                 <iron-icon icon="check"/>
83 | |             </div>
84 | |         }
   | |_________^
   |
   = help: message: called `Result::unwrap()` on an `Err` value: Error { variant: ParsingError { positives: [tag, text], negatives: [] }, location: Pos(8), line_col: Pos((1, 9)), path: None, line: "< div > < iron - icon icon = \"check\" / > < / div >", continued_line: None }

To untrained eyes, it looks like it is trying to separate the tag name using the '-'.

Testing the grammar on pest.rs shows the tokens just fine.

- tag
  - tag_name: "div"
  - attributes: ""
  - children > tag
    - tag_name: "iron-icon"
    - attributes
      - key: "icon"
      - string: "check"
- EOI: ""

Changing the iron-icon tag to ironicon allows the code to compile, but then the tag is wrong.