Increase Ruby versions support

To make this library more accessible, I am increasing the number of
ruby versions supported.

I initially limited the support to very recent Ruby versions for two
reasons:
- support only branches in normal maintenance
- reduce the precision difference in BigDecimal with older versions

Now that BigDecimal has been removed from the project (e3d862f), this is
a good opportunity to increase the Ruby versions support, so that older
versions of Ruby are supported even if these versions are in EOL
maintenance mode.

.github/workflows/main.yml

@@ -15,11 +15,10 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 3.2.0
-          - 3.2.1
-          - 3.2.2
-          - 3.2.3
-          - 3.3.0
+          - 3.0
+          - 3.1
+          - 3.2
+          - 3.3
     steps:
       - name: checkout
         uses: actions/checkout@v4

astronoby.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |spec|
   spec.description = "Ruby version of the calculations from various books like Celestial Calculations by J. L. Lawrence, Practical Astronomy with your Calculator or Spreadsheet by Peter Duffett-Smith and Jonathan Zwart, or Astronomical Algorithms by Jean Meeus"
   spec.homepage = "https://github.com/rhannequin/astronoby"
   spec.license = "MIT"
-  spec.required_ruby_version = ">= 3.2.0"
+  spec.required_ruby_version = ">= 3.0.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage

lib/astronoby/bodies/sun.rb

@@ -1,5 +1,9 @@
 # frozen_string_literal: true
 
+# rubocop:disable Lint/RedundantRequireStatement
+require "set"
+# rubocop:enable Lint/RedundantRequireStatement
+
 module Astronoby
   class Sun
     SEMI_MAJOR_AXIS_IN_METERS = 149_598_500_000

spec/astronoby/angle_spec.rb

@@ -305,7 +305,6 @@ def clear
       angle1 = Astronoby::Angle.from_degrees(180)
       angle1_bis = Astronoby::Angle.from_degrees(180)
       set = Set.new([angle1])
-
       expect(set.include?(angle1_bis)).to be true
     end
   end