drop win/osx from ci

Author: disruptek

.github/workflows/ci.yml

@@ -50,10 +50,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest]
         compiler:
           - name: nim
-            version: [devel, version-2-0, version-1-6, version-1-4, version-1-2]
+            version: ['devel', 'version-2-0', 'version-1-6', 'version-1-4', 'version-1-2']
           - name: nimskull
             version: "*"
 
@@ -142,7 +142,7 @@ jobs:
           github.event_name == 'push' && github.ref == 'refs/heads/master' &&
           matrix.compiler.name == 'nim' && matrix.os == 'ubuntu-latest' &&
           matrix.compiler.version == 'devel'
-        uses: crazy-max/ghaction-github-pages@v1
+        uses: crazy-max/ghaction-github-pages@v4.0.0
         with:
           build_dir: project/docs
         env: