v3.1.6: Fix test, bump audit dependencies, update readme.

What's Changed

• fix: fussy test exception code & audit bump dependencies by @tiagosiebler in #137
• chore(v3.1.6): version bump for release. Bump audit dependency, fix fussy test, update readme with reference to Siebly.io quick start guide for bitget node.js & javascript SDK by @tiagosiebler in #138

Full Changelog: v3.1.5...v3.1.6