Ticker::active() is not implemented

[fabianoriccardi]

I was trying to use this method in my project, but the compiler tells me the following message:

undefined reference to `Ticker::active()'

I've looked at the latest commit on master, and it seems it is not implemented.

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[stale]

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[laercionit]

bool Ticker::active() const
{
return _timer;
}

Include on ticker.cpp