Merge pull request #567 from TOMP-WG/1.6

Release v1.6

README.md

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 Transport Operator Mobility-as-a-service Provider (TOMP) API development Github
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 The TOMP working group aims to develop and sustain an internationally governed interoperable open standard for technical communication between Transport Operators and MaaS Providers, by means of definition, improvement, alignment and dissemination.
 
 I need help, where can I find it? / How do I start implementing TOMP?
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 If you need help with your TOMP-integration as a Transport Operator or a MaaS-Provider, use the following channels:
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  1. First look at the [Wiki](https://github.com/TOMP-WG/TOMP-API/wiki), a lot of flows are described there. The wiki relates to the latest API-version.
  2. If you have any questions regarding TOMP or how to implement it, please find us in Slack. There are a lot of developers there that can help you. Slack is a chat tool and very easy to use.
 
 Where can I find the API-documentation?
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 OpenAPI 3.0 documentation is available at [Swaggerhub](https://app.swaggerhub.com/apis-docs/TOMP-API-WG/transport-operator_maas_provider_api/).
 
 The Blueprint for an Transport Operator to Mobility-as-a-service Provider API is available at the [documentation page](https://github.com/TOMP-WG/TOMP-API/tree/master/documents). 
 
 How can I join the TOMP working group?
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 Join our [Slack space](https://join.slack.com/t/tomp-wg/shared_invite/zt-e3fftun7-qCs8FyXZPPy9pt_opyFw0QPlease) or contact Jed ([email protected]) to be added to our mailing list and to receive invites for the working group meetings.
 
 The working group meetings take place every month with the goal to develop and specify a generic TOMP-API for use by Transport Operators and Mobility-as-a-service Providers. All reports can be found at the [documentation page](https://github.com/TOMP-WG/TOMP-API/tree/master/documents/working%20group%20reports).
 
+Code of conduct
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+[Our code of conduct](https://github.com/TOMP-WG/TOMP-API/blob/master/code_of_conduct.md) [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](code_of_conduct.md)
 
 <img align="center" src="https://github.com/TOMP-WG/website/blob/master/wiki/images/TOMP%20WG%20grey.png" width="300">