Update Downstream.yml

Author: ChrisRackauckas

.github/workflows/Downstream.yml

@@ -22,7 +22,7 @@ jobs:
           - 1
           - 4
           - 10
-        julia-version: [1,1.6]
+        julia-version: [1,'lts','pre']
         os: [ubuntu-latest]
         package:
           - {user: JuliaSIMD, repo: LoopVectorization.jl, group: Interface}