Do not use latest npm on Travis

pioug · pioug · commit bfc305ba01a0 · 2020-04-11T01:38:51.000+08:00
diff --git a/.travis.yml b/.travis.yml
@@ -6,8 +6,6 @@ node_js:
   - "0.11"
   - "0.10"
   - "iojs"
-before_install:
-  - npm install -g npm
 install:
   - npm install
 script: "npm run-script ci"
