Update .travis.yml

Luc · web-flow · commit 131781c0c446 · 2018-03-23T12:29:10.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -24,6 +24,7 @@ before_script:
   - npm install --save-dev gulp-replace
   - npm install --save-dev fs
   - npm install --save-dev gulp-smoosher
+  - npm install gulp
   
 
 script:
