Add Asciidoctor to Travis

Fixes #2250

diff --git a/.travis.yml b/.travis.yml
index 310df39d9f74fa2c82b0636c7992f95365b48c49..ca6637edf9ebcaffe5dd841860a86cbaaf08cbdf 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,8 @@ script:
   - go build -race
   - ./hugo -s docs/
   - ./hugo --renderToMemory -s docs/
+before_install:
+  - gem install asciidoctor
 install:
   - go get github.com/stretchr/testify
   - go get -v ./...