newsletter-mailgun-0: dependencies

Dependencies for newsletter-mailgun-0

library	base (>=4.12.0.0 && <4.13) exceptions (>=0.10 && <0.11) lens (>=4.17 && <4.18) machines (>=0.6 && <0.7) mailgun (>=0.2 && <0.3) mime-mail (>=0.5 && <0.6) mtl (>=2.2 && <2.3) newsletter (<0.1) text (>=1.2 && <1.3)