Fix travis syntax

gkellogg · gkellogg · commit 49d46ff7f8ba · 2019-01-12T12:41:01.000-08:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,8 +6,7 @@ before_install:
   - 'gem update bundler --conservative'
 env:
   - CI=true
-  global:
-    - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+  - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
 gemfile:
   - Gemfile
   - Gemfile-pure
