update README

Author: delfrrr

README.md

@@ -11,7 +11,7 @@ delaunator-cpp is a C++ port from https://github.com/mapbox/delaunator a JavaScr
 ## Features
 
 * Probably the fastest C++ open source 2D Delaunay implementation
-* Roughly 3 times faster then JS version.
+* Roughly 20 times faster then JS version.
 * Example showing triangulation of GeoJson points
 
 ## Usage
@@ -44,8 +44,3 @@ int main() {
 ```
 
 [See more examples here](./examples)
-
-## TODO
-
-* Benchmarks
-* Unit tests