Update authors

Author: vincentvanbush

lit.gemspec

@@ -5,7 +5,8 @@ require 'lit/version'
 Gem::Specification.new do |s|
   s.name        = 'lit'
   s.version     = Lit::VERSION
-  s.authors     = ['Maciej Litwiniuk', 'Piotr Boniecki', 'Michał Buszkiewicz']
+  s.authors     = ['Maciej Litwiniuk', 'Piotr Boniecki', 'Michał Buszkiewicz',
+                   'Szymon Soppa']
   s.email       = ['[email protected]']
   s.license     = 'MIT'
   s.homepage    = 'https://github.com/prograils/lit'