Update CI

Author: cabol

.github/workflows/ci.yml

@@ -3,10 +3,10 @@ name: CI
 on:
   push:
     branches:
-      - master
+      - v2
   pull_request:
     branches:
-      - master
+      - v2
 
 jobs:
   nebulex_test:
@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - elixir: 1.17.x
+          - elixir: 1.18.x
             otp: 27.x
             os: 'ubuntu-latest'
             style: true
@@ -27,20 +27,14 @@ jobs:
             dialyzer: true
             doctor: true
           - elixir: 1.17.x
-            otp: 26.x
-            os: 'ubuntu-latest'
-          - elixir: 1.16.x
-            otp: 26.x
+            otp: 27.x
             os: 'ubuntu-latest'
-          - elixir: 1.15.x
+          - elixir: 1.17.x
             otp: 25.x
             os: 'ubuntu-latest'
           - elixir: 1.14.x
             otp: 24.x
             os: 'ubuntu-latest'
-          - elixir: 1.12.x
-            otp: 23.x
-            os: 'ubuntu-20.04'
 
     env:
       GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'