My mistake, i've adapted the code slightly, you can remove the line "lastValue = sensorValue;", i forgot to delete that.
If your using the Uno as the Rx or Tx end, you'll need to use the newer version of the Manchester library. The syntax is slightly different. The bottom link shows examples of how to do it. The top link is the new library. You still need to use the older version on the AtTiny45 end. They should be able to transmit to each other. But i can't guarantee it 100% as i haven't tried it. I use two ATTiny85's one for Rx, one for Tx.
https://github.com/mchr3k/arduino-libs-manchester/archive/master.zip
I'll try it tomorrow and see if it works and I'll post here if i get it working.