fix: update linking for samples (#56)

Author: JustinBeckwith

packages/google-cloud-dns/.circleci/config.yml

@@ -91,7 +91,6 @@ jobs:
             if ! test -x "$repo_tools"; then
               chmod +x "$repo_tools"
             fi
-            npm link
       - run:
           name: Run unit tests.
           command: npm test
@@ -118,9 +117,8 @@ jobs:
           name: Link the module being tested to the samples.
           command: |
             cd samples/
-            npm link @google-cloud/dns
             npm install
-            cd ..
+            npm link ../
       - run:
           name: Run linting.
           command: npm run lint