Release Version 0.2.0

[beeme1mr]

Release checklist:

• [x] Release spec v0.2.0
• [x] Update spec badge on the org readme
• [x] Create issues in the SDK repos containing the new requirements
  • [x] Java
  • [x] Node
  • [x] Golang
  • [x] Python
  • [x] .NET
• [x] open-feature/docs.openfeature.dev#49

[beeme1mr]

Spec v0.2.0 badge