Update CI

Author: janbruedigam

.github/workflows/ci.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       matrix:
         version:
-          - '1.3'
           - '1.4'
+          - '1.5'
           - 'nightly'
         os:
           - ubuntu-latest
@@ -41,7 +41,7 @@ jobs:
 #      - uses: actions/checkout@v2
 #       - uses: julia-actions/setup-julia@v1
 #         with:
-#           version: '1.4'
+#           version: '1.5'
 #      - run: julia --project=docs -e '
 #          using Pkg;
 #          Pkg.develop(PackageSpec(; path=pwd()));