fix simple trailing whitespace

fixes #742

https://bugs.ruby-lang.org/issues/7175

@bf4 @jeremy 
hmm not sure what you are saying a solution would be, I though you said
it's good if we only match trailing equal on newlines ... but that was
obviously not it :)


On Sun, Jul 27, 2014 at 9:40 AM, Jeremy Kemper <notifications@github.com>
wrote:

> In spec/mail/encodings/quoted_printable_spec.rb:
>
> >    it "should decode quoted printable text" do
> >      result = "\000\000\000\000"
> > -    expect(Mail::Encodings::QuotedPrintable.decode("=00=00=00=00")).to eq result
> > +    expect(decode("=00=00=00=00")).to eq result
> > +  end
> > +
> > +  # https://bugs.ruby-lang.org/issues/7175
> > +  it "should remove trailing equal" do
> > +    expect(utf8(decode("t=C3=A5=E2=88=82=C6=92t="))).to eq "tå∂ƒt"
> >    end
>
> so change the it to only match =+newline ?
>
> Huh?
>
> —
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> <https://github.com/mikel/mail/pull/753/files#r15440177>.
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