Bump resolver again

Author: quasicomputational

stack.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2018-02-26
+resolver: nightly-2018-02-28
 packages:
   - location: ./packages/xml
   - location: ./packages/mappend
@@ -13,4 +13,3 @@ extra-deps:
   - base-noprelude-4.10.1.0@rev:0
   #TODO: https://github.com/fpco/stackage/issues/3312
   - transformers-compat-0.6.0.5@rev:0
-  - optparse-applicative-0.14.2.0@rev:0