WA: WA 704 missing

[Bruce]

Just here to request inclusion of WA 704, as it seems unlikely to be extended to its full length and the existing section is signed: https://goo.gl/maps/QoVMcDVJkW1XzoqZA

(The erroneous shield has since been replaced with a proper WA marker at the same spot, last I checked)

[compdude787]

I've created a pull request for this:

https://github.com/TravelMapping/HighwayData/pull/4744