bumping to version 0.2.1

Author: cezheng

PySwiftyRegex.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "PySwiftyRegex"
-  s.version      = "0.2.0"
+  s.version      = "0.2.1"
   s.license      = "MIT"
   s.summary      = "Easily deal with Regex in Swift in a Pythonic way"
   s.homepage     = "https://github.com/cezheng/PySwiftyRegex"