Fix 0.9.0-M1 upgrade instructions
Fix 0.9.0-M1 upgrade instructions

0.9.0-M1 is artificially incompatible with all other versions, though
the storage format should generally interop with older versions.

dylanht/titan,thinkaurelius/titan,samanalysis/titan,banjiewen/titan,banjiewen/titan,elubow/titan,dylanht/titan,pluradj/titan,samanalysis/titan,mbrukman/titan,samanalysis/titan,elubow/titan,amcp/titan,dylanht/titan,CYPP/titan,englishtown/titan,pluradj/titan,englishtown/titan,mbrukman/titan,elubow/titan,samanalysis/titan,CYPP/titan,CYPP/titan,banjiewen/titan,banjiewen/titan,englishtown/titan,dylanht/titan,graben1437/titan,elubow/titan,pluradj/titan,mbrukman/titan,amcp/titan,graben1437/titan,thinkaurelius/titan,amcp/titan,mbrukman/titan,CYPP/titan,mbrukman/titan,amcp/titan,thinkaurelius/titan,pluradj/titan,thinkaurelius/titan,graben1437/titan,graben1437/titan,englishtown/titan