Add note about ID collisions.
Add note about ID collisions.

jparyani/capnproto,joliss/capnproto,kamalmarhubi/capnproto,rcrowder/capnproto,a-richardson/capnproto,maurer/capnproto,pjulien/capnproto,martindale/capnproto,nagyistoce/capnproto,pjulien/capnproto,vladon/capnproto,geofft/capnproto,ocdtrekkie/capnproto,martindale/capnproto,martindale/capnproto,modulexcite/capnproto,ocdtrekkie/capnproto,jparyani/capnproto,hntrmrrs/capnproto,bsn069/capnproto,modulexcite/capnproto,mologie/capnproto,jparyani/capnproto-boostpython,bsn069/capnproto,artillery/capnproto,jparyani/capnproto-boostpython,joliss/capnproto,MarPiRK/capnproto,maurer/capnproto,mrdomino/capnproto,rcrowder/capnproto,johnkdoe/capnproto,johnkdoe/capnproto,kamalmarhubi/capnproto,mrdomino/capnproto,jparyani/capnproto-boostpython,nagyistoce/capnproto,ligzy/capnproto,MarPiRK/capnproto,mologie/capnproto,hntrmrrs/capnproto,vladon/capnproto,geofft/capnproto,jparyani/capnproto-boostpython,ligzy/capnproto,khklau/capnproto,ligzy/capnproto,a-richardson/capnproto,hntrmrrs/capnproto,modulexcite/capnproto,jparyani/capnproto,Fraser999/capnproto,Fraser999/capnproto,joliss/capnproto,zarvox/capnproto,zarvox/capnproto,bsn069/capnproto,bryce-gibson/capnproto,bryce-gibson/capnproto,khklau/capnproto,mologie/capnproto,bryce-gibson/capnproto,artillery/capnproto,pjulien/capnproto,artillery/capnproto,jparyani/capnproto-boostpython,zarvox/capnproto,vladon/capnproto,rcrowder/capnproto,geofft/capnproto,maurer/capnproto,khklau/capnproto,nagyistoce/capnproto,ocdtrekkie/capnproto,johnkdoe/capnproto,mrdomino/capnproto,kamalmarhubi/capnproto,a-richardson/capnproto,Fraser999/capnproto,MarPiRK/capnproto