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Changes between Version 2 and Version 3 of Screwtape

v2	v3
17	17	* There's even a fourth way to configure where log messages go: `startLoggingWithObserver` which is a combination of the first and third methods (actually `startLogging` instantiates an observer of the second kind, converts it to an observer of the third kind, then hands it to `startLoggingWithObserver`).
18	18	* Something needs to record that Twisted's logging system is actually a notification broadcast system, not limited to appending lines of text to a file.
19		* Something needs to document the tricks of implementing a log observer; in particular, `textFromEventDict` does all the heavy lifting.
	19	* Something needs to document the tricks of implementing a log observer:
	20	* `textFromEventDict` does all the heavy lifting.
	21	* You should be careful to filter out events that aren't obviously intended to be logged to files; in particular, ignore things that have neither "message" nor "format" keys (is this actually right?)