#19 Simplify travis definition

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# Date:      Thu Jun 27 22:23:13 2019 +0200
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#	modified:   .travis.yml
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.travis.yml

@@ -1,27 +1,22 @@
-sudo: false
-
+sudo: true
+language: haskell
 cache:
   directories:
     - $HOME/.stack/
 
 matrix:
   include:
   - env: BUILD=stack ARGS=""
-    compiler: ": #stack default"
     addons:
       apt:
         packages:
           - libgtk2.0-dev
           - libgtk-3-dev
           - libgtksourceview-3.0-dev
-        sources:
-          - hvr-ghc
+          - happy
 
 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'
-
+- curl -sSL https://get.haskellstack.org/ | sh
 
 install:
   - stack -j 2 setup --no-terminal