Change the gemspec to improve formatting

tty-color.gemspec

@@ -3,29 +3,28 @@
 require_relative "lib/tty/color/version"
 
 Gem::Specification.new do |spec|
-  spec.name          = "tty-color"
-  spec.version       = TTY::Color::VERSION
-  spec.authors       = ["Piotr Murach"]
-  spec.email         = ["[email protected]"]
-  spec.summary       = %q{Terminal color capabilities detection}
-  spec.description   = %q{Terminal color capabilities detection}
-  spec.homepage      = "https://ttytoolkit.org"
-  spec.license       = "MIT"
-  if spec.respond_to?(:metadata=)
-    spec.metadata = {
-      "allowed_push_host" => "https://rubygems.org",
-      "bug_tracker_uri"   => "https://github.com/piotrmurach/tty-color/issues",
-      "changelog_uri"     => "https://github.com/piotrmurach/tty-color/blob/master/CHANGELOG.md",
-      "documentation_uri" => "https://www.rubydoc.info/gems/tty-color",
-      "funding_uri"       => "https://github.com/sponsors/piotrmurach",
-      "homepage_uri"      => spec.homepage,
-      "rubygems_mfa_required" => "true",
-      "source_code_uri"   => "https://github.com/piotrmurach/tty-color"
-    }
-  end
-  spec.files         = Dir["lib/**/*"]
+  spec.name = "tty-color"
+  spec.version = TTY::Color::VERSION
+  spec.authors = ["Piotr Murach"]
+  spec.email = ["[email protected]"]
+  spec.summary = "Terminal color capabilities detection."
+  spec.description = "Terminal color capabilities detection."
+  spec.homepage = "https://ttytoolkit.org"
+  spec.license = "MIT"
+  spec.metadata = {
+    "allowed_push_host" => "https://rubygems.org",
+    "bug_tracker_uri" => "https://github.com/piotrmurach/tty-color/issues",
+    "changelog_uri" =>
+      "https://github.com/piotrmurach/tty-color/blob/master/CHANGELOG.md",
+    "documentation_uri" => "https://www.rubydoc.info/gems/tty-color",
+    "funding_uri" => "https://github.com/sponsors/piotrmurach",
+    "homepage_uri" => spec.homepage,
+    "rubygems_mfa_required" => "true",
+    "source_code_uri" => "https://github.com/piotrmurach/tty-color"
+  }
+  spec.files = Dir["lib/**/*"]
   spec.extra_rdoc_files = ["README.md", "CHANGELOG.md", "LICENSE.txt"]
-  spec.bindir        = "exe"
+  spec.bindir = "exe"
   spec.require_paths = ["lib"]
   spec.required_ruby_version = ">= 2.0.0"