chore(ci): match GitHub Pages versions

DirtyF · DirtyF · commit 9e92f3058118 · 2018-10-08T14:34:48.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -12,9 +12,9 @@ rvm:
   - 2.3
 env:
   - ""
-  - JEKYLL_VERSION=3.7.3
+  - JEKYLL_VERSION=3.7.4
 matrix:
   include:
     - # GitHub Pages
-      rvm: 2.4
+      rvm: 2.5.1
       env: GH_PAGES=true
