Rename pgx.Connection to pgx.Conn
Rename ConnectionParameters to ConnConfig
Rename ConnectionPool to ConnPool
Rename ConnectionPoolStat to ConnPoolStat
Rename ConnectionPoolOptions to ConnPoolConfig
Fix example URL shortener
ConnPoolConfig embeds ConnConfig
Add constants for transaction isolation levels
Add CommandTag
Add QueryArgs
Replace logging functionality with log15

gopkg.in/inconshreveable/log15.v2
Improve logging
Improve logging some more
Fix a couple go vet discovered issues
Reduce nesting in message loops
Handle ValueTranscoder EncodeTo returns error on bad type

Instead of panicking
ValueTranscoder EncodeTo now receives io.Writer
Remove MessageWriter
Expose DataRowReader FieldDescriptions
Prepare returns *PreparedStatement