v2.0.1

Release notes - breaking changes:

• Added new wasSuccessful return value
• Return values are now []interface{} so you don't have to import reflect
• WaitTime is now a time.Duration
• Exponent is not optional, and it's not a pointer to an int64 any more

v1.1.0

• Added jitter to backoff
• Added ExecuteWithRetry() for userland type safety