update travis

Author: bw1

.travis.yml

@@ -1,6 +1,6 @@
 language: ruby
 rvm:
-- 2.4.1
+- 3.0.5
 
 before_script:
  - chmod +x ./_scripts/build-jekyll.sh # or do this locally and commit

_scripts/build-jekyll.sh

@@ -7,5 +7,8 @@ bundle exec jekyll build --strict_front_matter
 # for right now, we don't want to test external sites
 # when we get closer to relaunch, remove this so that
 # we do test them.
-bundle exec htmlproofer ./_site --disable-external
-
+bundle exec htmlproofer ./_site \
+	--disable-external=true \
+	--enforce-https=false \
+	--allow-missing-href=true \
+	--check-internal-hash=false