Merge pull request #151 from RobLoach/ci

ci: Switch to ubuntu-20.04

Author: RobLoach

.github/workflows/Tests.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   Test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
     - uses: actions/checkout@v2