Add stack.lts10.yaml, switch to lts11 in stack.yaml.

stack.yaml

@@ -11,19 +11,12 @@ flags:
 packages:
 - '.'
 extra-deps:
-- pandoc-citeproc-0.14.3.1
 - skylighting-0.7.2
 - skylighting-core-0.7.2
-- ansi-terminal-0.8.0.2
-- tasty-1.0.1.1
-- test-framework-0.8.2.0
 - pandoc-types-1.17.5
-- cmark-gfm-0.1.3
-- hslua-module-text-0.1.2.1
 - texmath-0.11
 - haddock-library-1.6.0
 - HsYAML-0.1.1.1
-- text-1.2.3.0
 ghc-options:
    "$locals": -fhide-source-paths -XNoImplicitPrelude
-resolver: lts-10.10
+resolver: lts-11.17