bump version of data.xml to 0.0.8

[bradlucas]

To work with clojure 1.10 I needed to bump the version of data.xml.

This resolves the issue #18

https://github.com/nathell/clj-tagsoup/issues/18

[jvtrigueros]

I was able to get around this by excluding the library and including it myself:

,,,
:dependencies [[clj-tagsoup "0.3.0" :exclusions [org.clojure/data.xml]]
               [org.clojure/data.xml "0.0.8"]]
,,,

Ideally, it's best if this could be taken upstream but in a pinch, this'll work.