Vastly Improved API performance

What's Changed

The EV Finder API is now up to 90% faster for Ford API requests, and up to 30% faster for other manufacturers. This will reduce the end-to-end time for a given Ford inventory search from upwards of 60 seconds down to around 7 seconds. Other manufacturers are fractions of a second faster, but still faster 🏎️

• Adding support for concurrent HTTP requests with asyncio by @Ben-Chapman in #5
• Enabling gzipped responses for all API endpoints

Full Changelog: v1.1.3...v1.2.0