Bump version to 0.3.0.

Author: headius

lib/thread_safe/version.rb

@@ -1,5 +1,5 @@
 module ThreadSafe
-  VERSION = "0.2.0"
+  VERSION = "0.3.0"
 end
 
 # NOTE: <= 0.2.0 used Threadsafe::VERSION
@@ -18,4 +18,4 @@ def self.const_missing(name)
     end
   end
 
-end
+end