- add a note about snapshot isolation [ticket:2078]
- add a note about snapshot isolation [ticket:2078]

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