update minimum compiler

.github/workflows/single-include.yml

@@ -6,7 +6,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v2
     
     - name: update single include
       run: |
@@ -17,10 +17,6 @@ jobs:
       working-directory: ${{runner.workspace}}/inja/single_include/
       shell: bash
       run: |
-        pwd
-        ls inja
-        cat inja/inja.hpp
-        cat inja/inja_old.hpp
         diff inja/inja.hpp inja/inja_old.hpp >/dev/null
 
     - uses: actions/upload-artifact@v1