Bump actions/cache from 2.1.5 to 2.1.6 (#201)

Bumps [actions/cache](https://github.com/actions/cache) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.5...v2.1.6)

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

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

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
       - name: install tparse
         run: |
           export GO111MODULE="on" && go get github.com/mfridman/tparse@v0.8.3
-      - uses: actions/cache@v2.1.5
+      - uses: actions/cache@v2.1.6
         with:
           path: ~/go/bin
           key: ${{ runner.os }}-go-tparse-binary