Bump Ruby and Rails requirements in gemspec

factory\_bot 5 will only support Ruby 2.3 and higher, and Rails 4.2 and
higher. This includes all versions that have not yet reached EOL:

https://www.ruby-lang.org/en/downloads/branches/
https://guides.rubyonrails.org/maintenance_policy.html

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     factory_bot (4.11.1)
-      activesupport (>= 3.0.0)
+      activesupport (>= 4.2.0)
 
 GEM
   remote: https://rubygems.org/

factory_bot.gemspec

@@ -15,14 +15,14 @@ Gem::Specification.new do |s|
     %w[CONTRIBUTING.md GETTING_STARTED.md LICENSE NAME.md NEWS README.md .yardopts]
 
   s.require_path = "lib"
-  s.required_ruby_version = Gem::Requirement.new(">= 1.9.2")
+  s.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
 
   s.authors = ["Josh Clayton", "Joe Ferris"]
   s.email   = ["jclayton@thoughtbot.com", "jferris@thoughtbot.com"]
 
   s.homepage = "https://github.com/thoughtbot/factory_bot"
 
-  s.add_dependency("activesupport", ">= 3.0.0")
+  s.add_dependency("activesupport", ">= 4.2.0")
 
   s.add_development_dependency("activerecord")
   s.add_development_dependency("appraisal")

gemfiles/4.2.gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     factory_bot (4.11.1)
-      activesupport (>= 3.0.0)
+      activesupport (>= 4.2.0)
 
 GEM
   remote: https://rubygems.org/

gemfiles/5.0.gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     factory_bot (4.11.1)
-      activesupport (>= 3.0.0)
+      activesupport (>= 4.2.0)
 
 GEM
   remote: https://rubygems.org/

gemfiles/5.1.gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     factory_bot (4.11.1)
-      activesupport (>= 3.0.0)
+      activesupport (>= 4.2.0)
 
 GEM
   remote: https://rubygems.org/

gemfiles/5.2.gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: ..
   specs:
     factory_bot (4.11.1)
-      activesupport (>= 3.0.0)
+      activesupport (>= 4.2.0)
 
 GEM
   remote: https://rubygems.org/