Remove development dependency from gemspec

Author: numbcoder

sm2-crypto.gemspec

@@ -26,7 +26,4 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
-
-  spec.add_development_dependency "minitest", ">= 5.0"
-  spec.add_development_dependency "rake", ">= 13.0"
 end