import-module-string v2.0.0

• A simplification of dependency importing, resolving relative specifiers to absolute, leaving existing absolute specifiers alone. #1, #2
• Removes adapter option (no longer necessary) and adds new resolveImportContent callback function option to manually override import content, see example: https://github.com/zachleat/import-module-string/blob/4cd55cb96054b818dcde143cafe491d3bfb3620e/test/import-module-string.test.js#L240-L256

Milestone: https://github.com/zachleat/import-module-string/milestone/1?closed=1
Full Changelog: v1.0.5...v2.0.0