Handle unencoded equals in quoted printable sanitizer

[chris-garrett]

I ran into an issue today with the sanitizer. Another email from slack came through but this time it contained a url with query parameters. The '=' passes through to qp reader and fails. Here is my first pass. Thoughts?

[coveralls]

Coverage decreased (-0.01%) to 85.278% when pulling 29b4a40 on chris-garrett:develop into e6b7c6f on jhillyerd:develop.

[jhillyerd]

My first thought is "man Slack kinda sucks!" ;) I like your approach here though, nice! Could you add some tests to exercise the three red error paths in:

https://coveralls.io/builds/10212874/source?filename=quotedprint.go

Should be as easy as adding a few more cases to this test table:

https://github.com/jhillyerd/enmime/blob/master/quotedprint_test.go#L21

[chris-garrett]

Yes, definitely.

[coveralls]

Coverage increased (+0.5%) to 85.82% when pulling 3bd5d13 on chris-garrett:develop into e6b7c6f on jhillyerd:develop.

[jhillyerd]

Thank you!