Update the cusp/version.h to report 0.2.0.
Update the cusp/version.h to report 0.2.0.

It was previously reporting 0.1.0.  That's confusing since we've already
released 0.1.1.  Version 0.2.0 is just a tentative version number for
the next release.

sdalton1/cusplibrary,cusplibrary/cusplibrary,cusplibrary/cusplibrary,cusplibrary/cusplibrary,sdalton1/cusplibrary,sdalton1/cusplibrary,sdalton1/cusplibrary,cusplibrary/cusplibrary