Update evergreen config

Author: durran

.evergreen.yml

@@ -71,7 +71,6 @@ functions:
         # Load environment variables generated by `configure`
         . ~/compass_env.sh
         echo "//registry.npmjs.org/:_authToken=${compass_npm_token}" >> .npmrc
-        npm i -g npm
         npm install -g node-gyp yarn
         npm install
         npm run evergreen-expansions ${compass_distribution}