Fix compilation error when running tests

[ezk84]

The previously merged PR #588 was based off a previous version of the code. With the changes merged in the mean time tests do not compile with the following error:

$ go test ./...
# github.com/smartystreets/goconvey/convey
$GOPATH\pkg\mod\github.com\smartystreets\goconvey@v1.6.5\convey\context.go:190:49: not enough arguments in call to reporting.NewFailureReport
        have (string)
        want (string, bool)

This resolves that problem.

[riannucci]

Oops, thanks; I should have checked that the base was newer :/