Overview

Preparation work for Nano 12.

• Making the library ESM-only - remove any "require" use and replace with equivalent "import".
• version 12.
• Update README code to eliminate "require".
• Remove a bunch of legacy Nano code that dates back to the request/axios days. It's a bit simpler to read now with the "relax" method making the request and handling the response.
• The..AsStream variants of the functions are now "async" - i.e. they return a Promise which resolves to a stream, rather than synchronously returning a dummy stream as before. This makes the code easier to maintain, but is abreaking change.

Testing recommendations

All the tests have changed in the require-->import sense, but are functionally identical.

Checklist

• Code is written and works correctly;
• Changes are covered by tests;
• Documentation reflects the changes;