v1.2.5: Bump dependencies, add links to Siebly.io quickstart guides & tutorial

What's Changed

• feat(v1.2.5): link package docs to Siebly pages by @tiagosiebler in #150
• Coinbase QuickStart Guide: Coinbase JavaScript Getting Started
• Coinbase Tutorial Coinbase JavaScript & Node.js Tutorial

Full Changelog: v1.2.4...v1.2.5