Updated README and gemspec.

Author: jdantonio

README.md

@@ -235,8 +235,8 @@ The best practice is to depend on `concurrent-ruby` and let users to decide if t
 
 ## Maintainers
 
+* [Petr Chalupa](https://github.com/pitr-ch) (lead maintainer)
 * [Jerry D'Antonio](https://github.com/jdantonio) (creator)
-* [Petr Chalupa](https://github.com/pitr-ch)
 * [Michele Della Torre](https://github.com/mighe)
 * [Chris Seaton](https://github.com/chrisseaton)
 * [Paweł Obrok](https://github.com/obrok)

concurrent-ruby.gemspec

@@ -10,7 +10,7 @@ Gem::Specification.new do |s|
   s.name             = 'concurrent-ruby'
   s.version          = Concurrent::VERSION
   s.platform         = Gem::Platform::RUBY
-  s.authors          = ["Jerry D'Antonio", 'The Ruby Concurrency Team']
+  s.authors          = ["Jerry D'Antonio", 'Petr Chalupa', 'The Ruby Concurrency Team']
   s.email            = ['[email protected]', '[email protected]']
   s.homepage         = 'http://www.concurrent-ruby.com'
   s.summary          = 'Modern concurrency tools for Ruby. Inspired by Erlang, Clojure, Scala, Haskell, F#, C#, Java, and classic concurrency patterns.'