Add \social options: arXiv, INSPIRE

https://arxiv.org/ and https://inspirehep.net/ are websites on which
academics often have profiles that would be linked in a CV (particularly
physics and related fields).

Add social options through the academicons font.

moderncviconsawesome.sty

@@ -98,6 +98,8 @@
 \renewcommand*{\battlenetsocialsymbol}    {{\color{battlenet}\small\faBattleNet}~}
 %\renewcommand*{\signalsocialsymbol}       {}
 %\renewcommand*{\matrixsocialsymbol}       {}
+\renewcommand*{\arxivsocialsymbol}        {{\color{arxiv}{\small\faarXiv}}~}
+\renewcommand*{\inspiresocialsymbol}      {{\color{inspire}{\small\faInspire}}~}
 \renewcommand*{\bornsymbol}               {{\color{born}\small\faAsterisk}~}           % alternative: \faBabyCarriage
 
 \endinput