Version bump to 0.2.0.
Version bump to 0.2.0.

nickerso/libcellml,cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml,MichaelClerx/libcellml,cellml/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,nickerso/libcellml,hsorby/libcellml,MichaelClerx/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml