ion-rs 0.6.0

Implementation of Amazon Ion
Documentation
## Code of Conduct
This project has adopted the [Amazon Open Source Code of Conduct](https://aws.github.io/code-of-conduct). 
For more information see the [Code of Conduct FAQ](https://aws.github.io/code-of-conduct-faq) or contact 
opensource-codeofconduct@amazon.com with any additional questions or comments.