try testing with more versions of julia

Author: Christopher Doris

.github/workflows/tests.yml

@@ -69,7 +69,7 @@ jobs:
       matrix:
         arch: [x64] # x86 currently unsupported by MicroMamba/CondaPkg
         os: [ubuntu-latest, windows-latest, macos-latest]
-        jlversion: ['1']
+        jlversion: ['1','1.6','1.5','1.4','1.3','1.2','1.1','1.0']
         exclude:
         - os: macos-latest
           arch: x86