Version 1.2.0

• use overwriteMode=ignore if save mode is other than Append (#26)
• require non-nullable string fields _from and _to to write to edge collections (#25)
• configurable backoff retry delay for write requests (retry.minDelay and retry.maxDelay), disabled by default (#24)
• retry only if schema has non-nullable field _key (#23)
• retry on connection exceptions
• added retry.maxAttempts config param (#20)
• increased default timeout to 5 minutes
• reject writing decimal types with json content type (#18)
• report records causing write errors (#17)
• improved logging about connections and write tasks