travis: install npm 3 - it is basically required for babel 6

jamestalmage · jamestalmage · commit d361b01a1fc3 · 2015-12-21T22:59:57.000-05:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,5 +3,7 @@ node_js:
   - 'stable'
   - '0.12'
   - '0.10'
+before_install:
+  - 'npm i -g npm@latest'
 after_success:
   - '[ -z "$COVERALLS_REPO_TOKEN" ] && tap --coverage-report=text-lcov | ./node_modules/.bin/coveralls'
