DEV: run tests on the ruby version we *actually* use

DEV: run tests on the ruby version we actually use

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 20c4b6d..ad001e9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     name: Ruby ${{ matrix.ruby }}
     strategy:
       matrix:
-        ruby: ["2.6", "2.5"]
+        ruby: ["2.7"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-ruby@v1

GitHub sha: 86ed4825

This commit appears in #11 which was approved by davidtaylorhq. It was merged by Supermathie.