synchronized 1.2.0

Basic lock mechanism to prevent concurrent access to asynchronous code

Changelog

1.2.0

• Use generic instead of 2.0 deprecated comments

1.1.0

• Fix inner task issue, next outer task will wait for all inner tasks to terminate
• Properly handle nested thrown error

1.0.0

• Bump to version 1.0.0

0.1.0

• Initial version