Test on pre releases instead of nightly

Author: andreasnoack

.github/workflows/CI.yml

@@ -10,21 +10,24 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - version: 'nightly'
+          - version: 'pre'
             os: ubuntu-latest
             arch: x64
           - version: '1'
             os: ubuntu-latest
             arch: x64
-          - version: '1.6'
-            os: ubuntu-latest
-            arch: x64
           - version: '1'
             os: windows-latest
             arch: x64
           - version: '1'
             os: macos-latest
             arch: x64
+          - version: 'lts'
+            os: ubuntu-latest
+            arch: x64
+          - version: 'min'
+            os: ubuntu-latest
+            arch: x64
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v2