docs (#33)

README.md

@@ -1,15 +1,19 @@
+![Version](https://img.shields.io/badge/version-0.4.0-blue)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
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 [![codecov](https://codecov.io/github/thinks/poisson-disk-sampling/graph/badge.svg?token=NXIAKWPKAB)](https://codecov.io/github/thinks/poisson-disk-sampling)
 
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 [![Standard](https://img.shields.io/badge/c%2B%2B-17-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B17)
-![Version](https://img.shields.io/badge/version-0.4.0-blue)
 
 # tph_poisson
 This repository contains a [single file](include/thinks/tph_poisson.h), header-only, no-dependencies, C library for generating Poisson disk samplings in arbitrary dimensions. The implementation uses the techniques reported in the paper [Fast Poisson Disk Sampling in Arbitrary Dimensions](http://www.cs.ubc.ca/~rbridson/docs/bridson-siggraph07-poissondisk.pdf) published by [Rook Bridson](http://www.cs.ubc.ca/~rbridson/) in 2007.  
 
+Main features:
+* Custom allocator interface for memory management at run-time.
+* Possibility to override libc function at compile-time (using macros).
+
 ## Usage
 
 Poisson disk sampling aims to generate a set of points within a bounded region such that no two points are closer than some user-specified radius to each other. Let's consider a simple [example](examples/src/simple.c) written in C.