Fixed lts6 travis build.

.travis.yml

@@ -50,7 +50,7 @@ matrix:
 
   # The Stack builds. We can pass in arbitrary Stack arguments via the ARGS
   # variable, such as using --stack-yaml to point to a different file.
-  - env: BUILD=stack ARGS="--resolver lts-6"
+  - env: BUILD=stack ARGS="--resolver lts-6 --stack-yaml stack.lts6.yaml"
     compiler: ": #stack 7.10.3"
     addons: {apt: {packages: [ghc-7.10.3], sources: [hvr-ghc]}}
 
@@ -59,7 +59,7 @@ matrix:
     compiler: ": #stack nightly"
     addons: {apt: {packages: [libgmp-dev]}}
 
-  - env: BUILD=stack ARGS="--resolver lts-6"
+  - env: BUILD=stack ARGS="--resolver lts-6 --stack-yaml stack.lts6.yaml"
     compiler: ": #stack 7.10.3 osx"
     os: osx
 

stack.lts6.yaml

@@ -0,0 +1,13 @@
+flags:
+  pandoc:
+    trypandoc: false
+    https: true
+    embed_data_files: false
+    old-locale: false
+    network-uri: true
+packages:
+- '.'
+extra-deps:
+- data-default-0.6.0
+- http-client-0.5.0
+- http-client-tls-0.3.0