Bump actions/setup-node from v1 to v2.1.5 (#27)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v1 to v2.1.5.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v1...46071b5)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v1
 
       - name: Use Node.js
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2.1.5
         with:
           node-version: ${{ matrix.node-version }}