[TASK] remove composer-lowest, add badge

.github/workflows/cgl-and-unit.yaml

@@ -17,17 +17,3 @@ jobs:
       -   run: composer update --no-interaction --no-progress
       -   run: composer show
       -   run: composer tests-for:ci
-  unit-tests-lowest:
-    runs-on: ubuntu-18.04
-    strategy:
-      fail-fast: false
-      matrix:
-        php-version: [7.2, 7.3]
-    steps:
-      -   uses: actions/checkout@v2
-      # PHP 7.1-.4 are available in ubuntu-18.04
-      # https://help.github.com/en/actions/automating-your-workflow-with-github-actions/software-installed-on-github-hosted-runners#ubuntu-1804-lts
-      -   run: sudo update-alternatives --set php /usr/bin/php${{ matrix.php-version }}
-      -   run: composer update --no-interaction --prefer-lowest --no-progress
-      -   run: composer show
-      -   run: composer tests-for:ci

README.md

@@ -1,4 +1,5 @@
 # Registration API for Content Blocks
+![CGL & unit tests](https://github.com/TYPO3-Initiatives/content-block-registration-api/workflows/CGL%20&%20unit%20tests/badge.svg?branch=master)
 
 ## Introduction