Fix builds on Node.js v14.

bnjmnt4n · bnjmnt4n · commit d2cded4549b3 · 2020-07-04T19:04:46.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -64,7 +64,7 @@ before_install:
       # ringo -v
 
   - nvm use $TRAVIS_NODE_VERSION
-  - npm i -g npm@^5
+  - [ $TRAVIS_NODE_VERSION == "14" ] && npm i -g npm@^6 || npm i -g npm@^5
 
 install:
   - npm i
