puts_debug.gemspec in puts_debug-0.2.0 vs puts_debug.gemspec in puts_debug-0.3.0

@@ -22,10 +22,10 @@
   end
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency 'rainbow', '~> 3'  # Gem for colorizing printed text on ANSI terminals
+  spec.add_runtime_dependency 'rainbow', '~> 3'  # Gem for colorizing printed text on ANSI terminals
 
   spec.add_development_dependency "bundler", "~> 1.16"
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "minitest", "~> 5.0"
 end