docs: update

.github/workflows/main.yml

@@ -2,10 +2,16 @@ name: Shellcheck
 on: [push]
 jobs:
   build:
-    runs-on: [ubuntu-latest, macOS-latest]
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
     - name: Run shellcheck.
       run: |
         shellcheck pfetch
         sh pfetch
+    runs-on: macOS-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Run shellcheck.
+      run: |
+        sh pfetch