Updated LTS version, 1.3 to 1.6 in ci (JuliaIO#187)

Co-authored-by: Brian Quadras <[email protected]>

Author: 2 people

.github/workflows/CI.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.3'
+          - '1.6'
           - '1'
           - 'nightly'
         os: