Update ci.yml

Author: ChrisRackauckas

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        julia-version: ['1']
+        julia-version: ['lts','1','pre']
         threads:
           - '1'
           - '3'