test Julia nightly on every PR (#301)

Author: simeonschaub

.github/workflows/CI.yml

@@ -35,6 +35,10 @@ jobs:
           - os: ubuntu-latest
             version: "1.5"
             arch: x64
+          # Julia Nightly
+          - os: ubuntu-latest
+            version: "nightly"
+            arch: x64
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1