update travis

Author: bosyi

.travis.yml

@@ -1,16 +1,11 @@
 language: node_js
 dist: trusty
 sudo: required
-node_js: 6
-env:
-  - PATH=$HOME/purescript:$PATH
+node_js: 10
 install:
-  - wget -O $HOME/purescript.tar.gz https://github.com/purescript/purescript/releases/download/v0.11.3/linux64.tar.gz
-  - tar -xvf $HOME/purescript.tar.gz -C $HOME/
-  - chmod a+x $HOME/purescript
-  - npm install -g bower pulp
+  - npm install -g bower pulp purescript@0.12.0
 script:
-  - npm install && bower install && pulp test
+  - bower install && pulp test
 after_success:
 - >-
   test $TRAVIS_TAG &&