Add intro

Author: jnewbery

_posts/en/newsletters/2018-07-10-newsletter.md

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+This week's newsletter includes news and action items about minimum fees and
+the upcoming Bitcoin Core release, a special feature on a Schnorr signature
+proposal, and a write-up of the recent Building on Bitcoin conference in
+Lisbon. *Divertam-se!*
+
 ## Action items
 
 - Bitcoin Core minimum relay fee may be reduced in the next major