mysqljs / mysql / 2296

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Pull #2310

travis-ci

Update documentation around custom formatters.

The example worked for me but since 99.9% of the existing project was using ? placeholders I tidied the Function example up to first check if the SQL statement used ? and then customised for that before checking if it should be named parameters.  Also we have one SQL that seems to be using := assignment, I have added a condition for it to not effect that.

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