Add StackOverflow to socials

Please add other social network options to the `\social[network]{username}` command, specifically Stack Overflow.
At least in the case of SO, it would not be difficult to add, just add this to the socials collection definition in moderncv.cls:

    \ifthenelse{\equal{#1}{stackoverflow}} {\collectionadd[stackoverflow]{socials} {\protect\httplink[#3]{www.stackoverflow.com/cv/#3}}} {}%

Add this to the 'other symbols' in moderncv.cls:
    \newcommand*{\stackoverflowsocialsymbol} {}

And this to the icon definitions in moderncviconsawesome.sty :

    \renewcommand*{\stackoverflowsocialsymbol} {{\small\faStackOverflow}~} % alternative: \faStackExchange

(And add it to the documentation and templates, and make up substitute symbols to add to moderncviconletters.sty and moderncviconmarvosym.sty.)
I'd fork and pull it myself (or whatever it is you do here), but I don't have the time to set up and learn how to use launchpad, so just posting this here so someone else can.