fixer.io API Client

The `fixer-api` library provides a robust and type-safe client for the fixer.io currency exchange rate API, supporting both Node.js and browser environments. The current stable version is v2.3.0. This package primarily sees maintenance releases to update dependencies and ensure compatibility, with new features (like `timeseries` or `symbols` endpoint support) arriving less frequently. Its key differentiators include zero runtime dependencies (as of v2.3.0, after dropping `node-fetch`), full TypeScript support for type safety and autocomplete, and a universal design that works across different JavaScript runtimes.