attempt code coverage

Author: michael-petersen

.github/workflows/ci.yml

@@ -25,6 +25,9 @@ jobs:
               using Pkg
               Pkg.develop(PackageSpec(path="/home/runner/work/DistributionFunctions.jl/DistributionFunctions.jl"))'
             julia --project=df test/runtests.jl
-
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4.0.1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}