chore: update minimum elixir version to 1.13

.github/workflows/elixir.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set up Elixir
       uses: erlef/[email protected]
       with:
-        elixir-version: '1.12.3' # Define the elixir version [required]
+        elixir-version: '1.13.4' # Define the elixir version [required]
         otp-version: '22.3' # Define the OTP version [required]
     - name: Restore dependencies cache
       uses: actions/cache@v2

mix.exs

@@ -4,8 +4,8 @@ defmodule Erebus.MixProject do
   def project do
     [
       app: :erebus,
-      version: "0.2.3",
-      elixir: "~> 1.12",
+      version: "0.2.4",
+      elixir: "~> 1.13",
       start_permanent: Mix.env() == :prod,
       deps: deps(),
       consolidate_protocols: Mix.env() != :test,