Merge pull request #118 from radarhere/bionic

Updated to Ubuntu 18.04

Author: homm

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
             "3.9",
             "3.10",
         ]
-        os: [ubuntu-16.04]
+        os: [ubuntu-18.04]
 
     steps:
       - uses: actions/checkout@v2