Drop Ruby 2.5 support

Because it has reached EOL for more than 1.5 years and it won't be
supported by the next reline version either.

2 files changed, 2 insertions, 6 deletions

diff --git a/lib/irb.rb b/lib/irb.rb
index 04009664ef..ab5702c9f2 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -598,11 +598,7 @@ module IRB
 
       if exc.backtrace
         order = nil
-        if '2.5.0' == RUBY_VERSION
-          # Exception#full_message doesn't have keyword arguments.
-          message = exc.full_message # the same of (highlight: true, order: bottom)
-          order = :bottom
-        elsif '2.5.1' <= RUBY_VERSION && RUBY_VERSION < '3.0.0'
+        if RUBY_VERSION < '3.0.0'
           if STDOUT.tty?
             message = exc.full_message(order: :bottom)
             order = :bottom
diff --git a/lib/irb/irb.gemspec b/lib/irb/irb.gemspec
index d443938043..c3e8a4dc58 100644
--- a/lib/irb/irb.gemspec
+++ b/lib/irb/irb.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = Gem::Requirement.new(">= 2.5")
+  spec.required_ruby_version = Gem::Requirement.new(">= 2.6")
 
   spec.add_dependency "reline", ">= 0.3.0"
 end