update test-ci.yml

Author: okbang9

.github/workflows/test-ci.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
       max-parallel: 1
       matrix:
-        php-versions: ['5.4', '5.5', '5.6', '7.0', '8.0']
+        php-versions: ['5.4', '5.5', '5.6', '7.0']
     runs-on: ubuntu-latest
     steps:
       - name: Checkout