libcurl4-openssl-dev to maybe avoid SSL errors in tests?

mlinksva · web-flow · commit b1baa060f29b · 2017-10-04T13:59:15.000-07:00
errors like #539 (comment) possible fix found at gjtorikian/html-proofer#376 (comment)
diff --git a/.travis.yml b/.travis.yml
@@ -7,6 +7,11 @@ language: ruby
 rvm:
   - 2.4.0
 
+addons:
+  apt:
+    packages:
+    - libcurl4-openssl-dev
+
 branches:
   only:
     - gh-pages
