Use external d3-interpolate

Author: devgru

README.md

@@ -49,11 +49,9 @@ $ yarn start
 
 ## TODO
 
-- Wait for [d3-interpolate/34](https://github.com/d3/d3-interpolate/pull/34) PR merge then remove bundled `d3-interpolate`;
-- Add benchmarks;
 - Add basic/advanced integrations comparison;
 - More tests;
-- More examples;
+- Better examples;
 - Improve examples and dependencies organization (300 MiB is too much);
 - Check for corner cases;
 - Rewrite in TS.