Add a FAQ to discuss URI::InvalidURIError httpi issue

Sparked by the always helpful @catskull on this issue: #488 (comment)
savonrb · Jul 1, 2014 · d3027b0 · d3027b0
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@@ -46,6 +46,10 @@ response.body
 For more examples, you should check out the
 [integration tests](https://github.com/savonrb/savon/tree/version2/spec/integration).
 
+## FAQ
+
+* URI::InvalidURIError -- if you see this error, then it is likely that the http client you are using cannot parse the URI for your WSDL. Try `gem install httpclient` or add it to your `Gemfile`.
+ - See https://github.com/savonrb/savon/issues/488 for more info
 
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