Raise Elixir version requirement to "~> 1.9"

Author: mneudert

.github/workflows/test.yml

@@ -9,16 +9,14 @@ jobs:
     strategy:
       matrix:
         include:
-          - elixir: '1.7.4'
-            otp: '19.3'
-          - elixir: '1.8.2'
-            otp: '20.3'
           - elixir: '1.9.4'
-            otp: '21.3'
+            otp: '20.3'
           - elixir: '1.10.4'
+            otp: '21.3'
+          - elixir: '1.11.4'
             otp: '22.3'
-          - elixir: '1.11.3'
-            otp: '23.0'
+          - elixir: '1.11.4'
+            otp: '23.3'
 
     env:
       MIX_ENV: test

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## v0.3.0-dev
+
+- Backwards incompatible changes
+    - Minimum required Elixir version is now `~> 1.9`
+
 ## v0.2.0 (2020-11-07)
 
 - Backwards incompatible changes

mix.exs

@@ -9,7 +9,7 @@ defmodule Geolix.Plug.MixProject do
       app: :geolix_plug,
       name: "Geolix Plug",
       version: @version,
-      elixir: "~> 1.7",
+      elixir: "~> 1.9",
       deps: deps(),
       description: "Geolix Plug",
       dialyzer: dialyzer(),