Remove outdated CppCon2016 link
Remove outdated CppCon2016 link

rbock/sqlpp11,sergeken/sqlpp11,volka/sqlpp11,volka/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11,volka/sqlpp11,volka/sqlpp11,rbock/sqlpp11,sergeken/sqlpp11