chore: adding elixir 1.18 to ci test job

Author: rNoz

.github/workflows/ci.yml

@@ -41,11 +41,13 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-20.04"]
-        elixir: ["1.15", "1.14", "1.13"]
+        elixir: ["1.18", "1.16", "1.15", "1.14", "1.13"]
         otp: ["26", "25", "24"]
         exclude:
           - elixir: "1.13"
             otp: "26"
+          - elixir: "1.18"
+            otp: "24"
     steps:
       - uses: actions/checkout@v3
       - uses: erlef/setup-beam@v1