Update CI now that 1.6 has been released (#18)

Author: DilumAluthge

.github/workflows/ci.yml

@@ -15,9 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '^1.6.0-0' # delete this line once Julia 1.6 is released
-          # - '1.6'    # uncomment this line once Julia 1.6 is released
-          # - '1'      # uncomment this line once Julia 1.6 is released
+          - '1.6'
+          - '1'
           - 'nightly'
         os:
           - ubuntu-latest
@@ -59,8 +58,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
         with:
-          version: '^1.6.0-0' # delete this line once Julia 1.6 is released
-          # version: '1'      # uncomment this line once Julia 1.6 is released
+          version: '1'
       - run: |
           julia --project=docs -e '
             using Pkg