#7 bot should handle mixed case scheme (Http, HTTP, etc)

09:23 ircuser : Http://wttr.in/Paris

09:23 ircuser : Http://wttr.in/Paris
09:23     bot : De link van ircuser toont: Weather report: Paris, France

What happens: ``` 09:23 ircuser : Http://wttr.in/Paris ``` What should happen: ``` 09:23 ircuser : Http://wttr.in/Paris 09:23 bot : De link van ircuser toont: Weather report: Paris, France ``` RFC 2396: "For resiliency, programs interpreting URLs should treat upper case letters as equivalent to lower case in scheme names (e.g., allow "HTTP" as well as "http")."