Add myself as author (#559)

Adding myself as an author to the gemspec at @iloveitaly's request. Appreciate the offer and thanks to the community for all their hard work on this gem. Glad to contribute back wherever I can.

netsuite.gemspec

@@ -3,8 +3,8 @@ require File.expand_path('../lib/netsuite/version', __FILE__)
 
 Gem::Specification.new do |gem|
  gem.licenses = ['MIT']
- gem.authors = ['Ryan Moran', 'Michael Bianco']
- gem.email = ['ryan.moran@gmail.com', 'mike@mikebian.co']
+ gem.authors = ['Ryan Moran', 'Michael Bianco', 'Chris Gunther']
+ gem.email = ['ryan.moran@gmail.com', 'mike@mikebian.co', 'chris@room118solutions.com']
  gem.description = %q{NetSuite SuiteTalk API Wrapper}
  gem.summary = %q{NetSuite SuiteTalk API (SOAP) Wrapper}
  gem.homepage = 'https://github.com/NetSweet/netsuite'