v2.1.17

What's Changed

• Reuse jackson instances like ObjectMapper to reduce memory usage by @mcweba in #637
• PR for release by @mcweba in #638
• Release attempt by @mcweba in #639
• sync Master to develop by @ZhengXinCN in #640
• PR-Release by @ZhengXinCN in #641

Full Changelog: v2.1.16...v2.1.17