Update to latest released version.

Author: joneshf

.travis.yml

@@ -7,9 +7,10 @@ before_install:
   - mkdir -p $HOME/bin
   - mkdir -p $HOME/.local/share/purescript/prelude
 install:
-  - wget -O $HOME/bin/psc https://github.com/joneshf/purescript/releases/download/v0.5.4.1/psc
-  - chmod a+x $HOME/bin/psc
-  - wget -O $purescript_datadir/prelude/prelude.purs https://github.com/joneshf/purescript/releases/download/v0.5.4.1/prelude.purs
+  - wget https://github.com/purescript/purescript/releases/download/v0.5.7.1/linux64.tar.gz
+  - tar zxvf linux64.tar.gz
+  - cp purescript/{docgen,psc,psci,psc-make} $HOME/bin
+  - cp purescript/prelude.purs $purescript_datadir/prelude/prelude.purs
   - "npm install bower grunt-cli -g"
   - "npm install"
   - "bower install"