v1.1.5

Changed

• fallback value null is no longer allowed (fixes #62).
• change handlers no longer receive null as new values, they get the actual new value for the relevant scope instead
  (fixes #64).

Fixed

• cds-plugin: unify and fix syntax of context.error and context.reject for cds service.
• change processing is more resilient. for redis message with multiple changes, if one change fails, then subsequent
  changes will still be processed.