Revert "Don't always auth in gitlab-ci.yml"

This reverts commit ef577dc3.

.gitlab-ci.yml

@@ -7,6 +7,7 @@ test:
   image: node:7.8-alpine
   script:
     - echo $NEXUS_NPM_TOKEN > ~/.npmrc
+    - echo 'always-auth=true' >> ~/.npmrc
     - npm set registry https://nexus.nsd.no/repository/npm-group/
     - yarn install
     - yarn run dtslint
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