Remake metadata object in gemspec into one assignment

Author: AlexWayfer

uri.gemspec

@@ -17,9 +17,11 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = '>= 2.4'
 
-  spec.metadata["homepage_uri"] = spec.homepage
-  spec.metadata["source_code_uri"] = spec.homepage
-  spec.metadata["documentation_uri"] = "https://rubydoc.info/gems/uri"
+  spec.metadata = {
+    "homepage_uri" => spec.homepage,
+    "source_code_uri" => spec.homepage,
+    "documentation_uri" => "https://rubydoc.info/gems/uri"
+  }
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.