Bump doctest upper bound to 0.15

Porges · Porges · commit 51a577b7d839 · 2018-02-15T13:01:04.000-08:00
Per commercialhaskell/stackage#3290
diff --git a/email-validate.cabal b/email-validate.cabal
@@ -56,5 +56,5 @@ test-suite doctests
     main-is: doctests.hs
     build-depends:
         base >= 4 && < 5,
-        doctest >= 0.8 && < 0.14
+        doctest >= 0.8 && < 0.15
 
