Update gemspec

Author: thisismydesign

json-streamer.gemspec

@@ -1,21 +1,29 @@
-# coding: utf-8
-lib = File.expand_path('../lib', __FILE__)
-$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'json/streamer/version'
+require_relative 'lib/json/streamer/version'
 
 Gem::Specification.new do |spec|
-  spec.name          = "json-streamer"
-  spec.version       = Json::Streamer::VERSION
-  spec.authors       = ["thisismydesign"]
-  spec.email         = ["thisismydesign@users.noreply.github.com"]
+  spec.name = "json-streamer"
+  spec.version = Json::Streamer::VERSION
+  spec.authors = ["thisismydesign"]
+  spec.email = ["thisismydesign@users.noreply.github.com"]
 
-  spec.summary       = %q{Utility to support JSON streaming allowing you to get data based on various criteria (key, nesting level, etc)}
-  spec.homepage      = "https://github.com/thisismydesign/json-streamer"
-  spec.license       = "MIT"
+  spec.summary = "Utility to support JSON streaming allowing you to get data based on various criteria (key, nesting level, etc)."
+  spec.homepage = "https://github.com/thisismydesign/json-streamer"
+  spec.license = "MIT"
 
-  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  spec.bindir        = "exe"
-  spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.metadata['homepage_uri'] = spec.homepage
+  spec.metadata['source_code_uri'] = 'https://github.com/thisismydesign/json-streamer'
+
+  # 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.
+  gemspec = File.basename(__FILE__)
+  spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
+    ls.readlines("\x0", chomp: true).reject do |f|
+      (f == gemspec) ||
+        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile])
+    end
+  end
+  spec.bindir = "exe"
+  spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
   # Because of `require_relative`