.travis.yml in jekyll-diagrams-0.6.0 vs .travis.yml in jekyll-diagrams-0.7.0

@@ -8,13 +8,17 @@
 
 addons:
   apt:
     packages:
       - default-jre
+      - gnuplot
       - graphviz
+      - node
+      - npm
       - python3
       - python3-pip
       - python3-setuptools
 
 before_install:
   - sudo pip3 install blockdiag seqdiag actdiag nwdiag
-  - gem update --system && gem install bundler
+  - gem update --system && gem install bundler
+  - npm install -g wavedrom-cli mermaid.cli
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