Fixed typo in README.md.
Fixed typo in README.md.

jgchristopher/moose,doug-martin/moose,grncdr/moose,Babay88/moose,doug-martin/moose,jgchristopher/moose,Babay88/moose,Babay88/moose,grncdr/moose,doug-martin/moose,jgchristopher/moose,grncdr/moose