Feature request: expose _last_sync_time about eztime

[ropg]

You wanna do this and make it a pull request or do I make it?

[mike-s123]

As I mentioned, I'm not that much of a coder. I can figure out logic errors and do basic stuff. But properly creating new functions in an object-oriented environment, etc., not so much.

[keith0603]

I would like to see this as well, but like mike-s123, don't have the knowledge to do the pull request myself. To add context, I am using the code on an esp8266 as a time-keeper feeding into a arduino that is running additional code. I want to keep the interrupts to the arduino a minimum, so only wanted to update after a NTP sync. If the internal NTP sync event were exposed, it seems an easy way to accomplish this. Great library and lives up to it's name! Thank you.

[ropg]

Added in 0.7.10