fix: small typo in the docs (actions#127)

jamielaux · web-flow · commit 24156c231c5e · 2020-08-11T15:47:33.000+02:00
diff --git a/README.md b/README.md
@@ -82,6 +82,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
+      matrix:
         # in this example, there is a newer version already installed, 3.7.7, so the older version will be downloaded
         python-version: [3.5, 3.6, 3.7.4, 3.8]
     steps:
