pr.yml in fluent-plugin-newrelic-1.2.3

- old
+ new

@@ -3,10 +3,10 @@
 on: [pull_request]
 
 jobs:
   ci:
     name: Continuous Integration pipeline
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
 