Added Formatter interface #40
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This means we can specify that formatting a `terror.Error` with a `%+v` format verb will return the `VerboseString()` form. This particularly helps with testing, because the `testify` library uses this format verb to output errors, giving us a full stack trace.
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This means we can specify that formatting a
terror.Errorwith a
%+vformat verb will return theVerboseString()form.This particularly helps with testing, because the
testifylibraryuses this format verb to output errors, giving us a full stack trace.
This is an alternative / complementary solution to #39.