Drop support for ruby < 3.0

.github/workflows/tests-and-linter.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.5, 2.6, 2.7, '3.0']
+        ruby: [2.7, 3.0, 3.1, 3.2]
 
     steps:
       - uses: actions/checkout@v2

.ruby-version

@@ -1 +1 @@
-2.5.8
+3.0.6

.tool-versions

@@ -0,0 +1 @@
+ruby 3.0.6

README.md

@@ -46,7 +46,7 @@ Then, add the required and optional fields
 class User
   extend EzAttributes
 
-  # Here name and age are required, and email has a default value, so it is optional.
+  # Here, `name` and `age` are required, and `email` has a default value, so it is optional.
   attributes :name, :age, email: 'guest@user.com'
 end
 
@@ -74,7 +74,6 @@ u = User.new(name: 'Matz', age: 22)
 
 u.name
 # NoMethodError (undefined method `name' for #<User:0x000055bac152f130>)
-
 ```
 
 ## Development

ez_attributes.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Easily define initializers with keyword args. It supports required and optional args."
   spec.homepage = "https://github.com/MatheusRich/ez_attributes.git"
   spec.license = "MIT"
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.5.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.0.0")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage