version bump & gemspec updates

lib/xeroizer/version.rb

@@ -1,3 +1,3 @@
 module Xeroizer
-  VERSION = "2.17.0".freeze
+  VERSION = "2.18.0".freeze
 end

xeroizer.gemspec

@@ -6,13 +6,19 @@ require 'xeroizer/version'
 Gem::Specification.new do |s|
   s.name = "xeroizer"
   s.version = Xeroizer::VERSION.dup
-  s.date = "2016-03-01"
   s.authors = ["Wayne Robinson"]
-  s.email = "[email protected]"
-  s.summary = "Xero library"
-  s.description = "Ruby library for the Xero accounting system API."
+  s.email = ["[email protected]", "[email protected]"]
+  s.summary = "Ruby Library for Xero accounting API"
+  s.description = "Ruby library for the Xero accounting API.  Originally developed by Wayne Robinson, now maintained by the Xero API Team & Xero/Ruby developer community."
   s.homepage = "http://github.com/waynerobinson/xeroizer"
   s.licenses = ["MIT"]
+  s.metadata = {
+    "bug_tracker_uri" => "https://github.com/waynerobinson/xeroizer/issues",
+    "changelog_uri" => "https://github.com/waynerobinson/xeroizer/releases",
+    "source_code_uri" => "https://github.com/waynerobinson/xeroizer",
+    "documentation_uri" => "https://developer.xero.com/documentation/",
+    "mailing_list_uri" => "https://developer.xero.com/subscribe-to-the-xero-api-developer-mailing-list"
+  }
 
   s.files = Dir["LICENSE.txt", "README.md", 'lib/**/*']
   s.test_files = `git ls-files -- test/*`.split("\n")