- add notes for prerelease install
- add notes for prerelease install

itkovian/sqlalchemy,brianv0/sqlalchemy,wfxiang08/sqlalchemy,elelianghh/sqlalchemy,Akrog/sqlalchemy,j5int/sqlalchemy,epa/sqlalchemy,j5int/sqlalchemy,wujuguang/sqlalchemy,itkovian/sqlalchemy,ThiefMaster/sqlalchemy,EvaSDK/sqlalchemy,bdupharm/sqlalchemy,inspirehep/sqlalchemy,elelianghh/sqlalchemy,zzzeek/sqlalchemy,brianv0/sqlalchemy,monetate/sqlalchemy,sandan/sqlalchemy,davidfraser/sqlalchemy,sandan/sqlalchemy,sqlalchemy/sqlalchemy,bdupharm/sqlalchemy,halfcrazy/sqlalchemy,wujuguang/sqlalchemy,davidjb/sqlalchemy,276361270/sqlalchemy,dstufft/sqlalchemy,olemis/sqlalchemy,bootandy/sqlalchemy,pdufour/sqlalchemy,davidfraser/sqlalchemy,wfxiang08/sqlalchemy,inspirehep/sqlalchemy,hsum/sqlalchemy,epa/sqlalchemy,WinterNis/sqlalchemy,robin900/sqlalchemy,dstufft/sqlalchemy,Akrog/sqlalchemy,ThiefMaster/sqlalchemy,graingert/sqlalchemy,robin900/sqlalchemy,monetate/sqlalchemy,halfcrazy/sqlalchemy,olemis/sqlalchemy,graingert/sqlalchemy,pdufour/sqlalchemy,EvaSDK/sqlalchemy,davidjb/sqlalchemy,276361270/sqlalchemy,hsum/sqlalchemy,WinterNis/sqlalchemy,bootandy/sqlalchemy