Add the current maintainer to the list of authors

Author: pointlessone

prawn.gemspec

@@ -29,12 +29,12 @@ Gem::Specification.new do |spec|
   spec.required_rubygems_version = '>= 1.3.6'
 
   spec.authors = [
-    'Gregory Brown', 'Brad Ediger', 'Daniel Nelson', 'Jonathan Greenberg',
-    'James Healy',
+    'Alexander Mankuta', 'Gregory Brown', 'Brad Ediger', 'Daniel Nelson',
+    'Jonathan Greenberg', 'James Healy',
   ]
   spec.email = [
-    '[email protected]', 'brad@bradediger.com', 'dnelson@bluejade.com',
-    '[email protected]', '[email protected]',
+    '[email protected]', '[email protected]', '[email protected]',
+    '[email protected]', '[email protected]', '[email protected]',
   ]
   spec.licenses = %w[PRAWN GPL-2.0 GPL-3.0]