[Testing:Travis] Move to xenial for running travis

Author: MasterOdin

.travis.yml

@@ -1,28 +1,30 @@
-dist: trusty
-sudo: false
 language: c
 cache:
   directories:
-  - "~/.stack/"
+    - "~/.stack/"
+
 addons:
   apt:
     packages:
     - libgmp-dev
+
 before_install:
-- mkdir -p ~/.local/bin
-- export PATH=$HOME/.local/bin:$PATH
-- travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
-- rvm use 2.1 --install --binary --fuzzy
+  - mkdir -p ~/.local/bin
+  - export PATH=$HOME/.local/bin:$PATH
+  - travis_retry curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+  - rvm use 2.1 --install --binary --fuzzy
+
 install:
-- travis_wait 30 stack --install-ghc --copy-bins install language-python
-- travis_wait 30 stack --install-ghc --copy-bins build
-- stack install hlint
-- gem install danger danger-hlint
+  - travis_wait 30 stack --install-ghc --copy-bins install language-python
+  - travis_wait 30 stack --install-ghc --copy-bins build
+  - stack install hlint
+  - gem install danger danger-hlint
+
 script:
-- stack test --only-dependencies
-- "./bin/hlint '--ignore=Parse error' src"
-- "./bin/hlint '--ignore=Parse error' app"
-- PATH=./bin:$PATH danger
+  - stack test --only-dependencies
+  - "./bin/hlint '--ignore=Parse error' src"
+  - "./bin/hlint '--ignore=Parse error' app"
+  - PATH=./bin:$PATH danger
 
 deploy:
   provider: releases