v1.1.12: Update examples, move optional dependencies to dev dependencies, update readme badges, bump dependencies post-audit

What's Changed

• refactor: update examples in CBAdvancedTradeClient to use ES6 import syntax and enhance documentation comments by @JJ-Cro in #131
• chore(v1.1.12): Move optionalDependencies to devDependencies and update README badges by @JJ-Cro in #132

Full Changelog: v1.1.11...v1.1.12

View all our Coinbase JavaScript SDK releases here: https://siebly.io/releases?sdk=coinbase-api