Run CI only in latest Julia

Author: iagochavarry

.github/workflows/ci.yml

@@ -15,9 +15,6 @@ jobs:
           - version: "1"
             os: ubuntu-latest
             arch: x64
-          - version: "1.0"
-            os: ubuntu-latest
-            arch: x64
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1