Only bother testing stable version

.github/workflows/ci.yml

@@ -4,34 +4,19 @@ on: [push, pull_request]
 
 jobs:
   run:
-    name: "Build using Racket '${{ matrix.racket-version }}' (${{ matrix.racket-variant }})"
+    name: "Build using Racket (${{ matrix.racket-variant }})"
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
-        racket-version: ["6.6", "6.7", "6.8", "6.9", "6.10.1", "6.11", "6.12", "7.0", "7.1", "7.2", "7.3", "7.4", "7.5", "7.6", "7.7", "7.8", "7.9", "8.0", "8.1", "8.2", "8.3", "8.4", "current"]
         racket-variant: ["BC", "CS"]
-        # CS builds are only provided for versions 7.4 and up so avoid
-        # running the job for prior versions.
-        exclude:
-          - {racket-version: "6.6",    racket-variant: "CS"}
-          - {racket-version: "6.7",    racket-variant: "CS"}
-          - {racket-version: "6.8",    racket-variant: "CS"}
-          - {racket-version: "6.9",    racket-variant: "CS"}
-          - {racket-version: "6.10.1", racket-variant: "CS"}
-          - {racket-version: "6.11",   racket-variant: "CS"}
-          - {racket-version: "6.12",   racket-variant: "CS"}
-          - {racket-version: "7.0",    racket-variant: "CS"}
-          - {racket-version: "7.1",    racket-variant: "CS"}
-          - {racket-version: "7.2",    racket-variant: "CS"}
-          - {racket-version: "7.3",    racket-variant: "CS"}
 
     steps:
     - uses: actions/checkout@master
     - uses: Bogdanp/setup-racket@v1.7
       with:
         distribution: 'full'
-        version: ${{ matrix.racket-version }}
+        version: stable
         variant: ${{ matrix.racket-variant }}
     - run: raco pkg install --batch --auto --link --name yaragg
     - run: xvfb-run raco test --drdr --package yaragg