travis: Lock asciidoctor to 1.5.4

1.5.5 (the newly released) seems to break.

diff --git a/.travis.yml b/.travis.yml
index 39540f10f9b1a2788b069076005730c1f161bdce..edce48c7419c086c1989c497477519df0d4f4a38 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,5 +19,5 @@ script:
   - ./hugo -s docs/
   - ./hugo --renderToMemory -s docs/
 before_install:
-  - gem install asciidoctor
+  - gem install asciidoctor -v 1.5.4
   - sudo pip install docutils