Show log(x).since combination in README

[jcouball]

Signed-off-by: James Couball jcouball@yahoo.com

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Description

• Adds some more detail to the README for the log function, specifically around combining with other filters.

.log.since respects the default count configuration which makes sense but isn't clear in the examples or the docs.
Perhaps naively I expected g.log.since('1 month ago') to return a whole month's worth of commits. Instead it consistently returned 30 which is the default for the count param. To return a whole month you have to also specify a greater maximum i.e. g.log(1000).since('1 month ago') depending on the amount of activity in the repository.

[jcouball]

This is the change that was meant to go in #699 for the 2.x release line.