Fix Synapse version in README.md

[cdavernas]

Fix the Synapse version (0.1.0-alpha1 to 0.1.2)

Many thanks for submitting your Pull Request :heart:!

Please specify parts this PR updates:

• [ ] Specification
• [ ] Schema
• [ ] Examples
• [ ] Extensions
• [ ] Roadmap
• [ ] Use Cases
• [ ] Community
• [ ] TCK
• [x] Other

What this PR does / why we need it:

Special notes for reviewers:

Additional information (if needed):

[JBBianchi]

Maybe the description needs to be changed as well: [Synapse](https://github.com/serverlessworkflow/synapse) is a Kubernetes-native workflow runtime which supports and is part of the Serverless Workflow eco-system. Doesn't seem accurate.

[tsurdilo]

@JBBianchi @cdavernas do you want to change the description per last comment before we merge this ?

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tsurdilo]

@cdavernas do you want to apply @JBBianchi last comment or are we good to merge this?

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.