Update to ruby/mspec@9542a88

Author: eregon

spec/mspec/README.md

@@ -36,7 +36,7 @@ specs in a manner compatible with multiple Ruby implementations.
 
 ## Requirements
 
-MSpec requires Ruby 2.5 or more recent.
+MSpec requires Ruby 2.6 or more recent.
 
 ## Bundler
 

spec/mspec/lib/mspec/utils/script.rb

@@ -280,8 +280,8 @@ def self.main
   end
 
   private def check_version!
-    ruby_version_is ""..."2.5" do
-      warn "MSpec is supported for Ruby 2.5 and above only"
+    ruby_version_is ""..."2.6" do
+      warn "MSpec is supported for Ruby 2.6 and above only"
     end
   end
 end