📌 Add specific versions to add_dependency

Author: kozo2

rubydown.gemspec

@@ -35,12 +35,11 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "kramdown"
-  spec.add_dependency "pry"
-  spec.add_dependency "daru"
-  spec.add_dependency "numo-narray"
-  spec.add_dependency "numo-gnuplot"
-  spec.add_dependency "rbplotly"
+  spec.add_dependency "kramdown", "~> 2.1"
+  spec.add_dependency "daru", "~> 0.2"
+  spec.add_dependency "numo-narray", "~> 0.9.1"
+  spec.add_dependency "numo-gnuplot", "~> 0.2.4"
+  spec.add_dependency "rbplotly", "~> 0.1.2"
 
   spec.add_development_dependency "bundler", "~> 1.17"
   spec.add_development_dependency "rake", "~> 10.0"