do not run "npm update" on TravisCI.

takaokouji · takaokouji · commit 048ba0045f3d · 2020-02-26T16:15:02.000+09:00
diff --git a/.travis.yml b/.travis.yml
@@ -19,7 +19,6 @@ before_install:
 - '[[ $(node -v) =~ ^v9.*$ ]] || npm install -g npm@latest' # skipped when using node 9
 install:
 - npm --production=false install
-- npm --production=false update
 script:
 - npm run test:lint
 - npm run test:unit
