Run on Ubuntu 18 and 20, forget about the soon unsupported 16

ibauersachs · ibauersachs · commit 2d19080b8c53 · 2021-02-15T14:21:21.000+01:00
Do not use -latest anymore as GitHubs migration process takes a long
time and it's unpredictable if a job runs on 18 or 20.
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -14,7 +14,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ ubuntu-16.04, ubuntu-latest, windows-latest ]
+        os: [ ubuntu-18.04, ubuntu-20.04, windows-latest ]
         java: [ '8', '11' ]
         arch: [ 'x32', 'x64' ]
         exclude:
