Fix travis

Author: Cyperwu

.travis.yml

@@ -33,6 +33,10 @@ jobs:
       - mkdir -p ~/tmp/nvim/bin
       - curl -L https://github.com/neovim/neovim/releases/download/v0.4.3/nvim.appimage -o ~/tmp/nvim/bin/nvim
       - chmod u+x ~/tmp/nvim/bin/nvim
+      
+    before_script:
+      - cd $HOME/build/heavenshell/vim-jsdoc
+      - make install
 
     script:
       - cd $HOME/build/heavenshell/vim-jsdoc/tests