Updating README.md

Url to Valve paper is broken. Updated to correct url.
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This is a utility for generating signed distance fields from vector shapes and font glyphs, This is a utility for generating signed distance fields from vector shapes and font glyphs,
which serve as a texture representation that can be used in real-time graphics to efficiently reproduce said shapes. which serve as a texture representation that can be used in real-time graphics to efficiently reproduce said shapes.
Although it can also be used to generate conventional signed distance fields best known from Although it can also be used to generate conventional signed distance fields best known from
[this Valve paper](http://www.valvesoftware.com/publications/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf) [this Valve paper](https://steamcdn-a.akamaihd.net/apps/valve/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf)
and pseudo-distance fields, its primary purpose is to generate multi-channel distance fields, and pseudo-distance fields, its primary purpose is to generate multi-channel distance fields,
using a method I have developed. Unlike monochrome distance fields, they have the ability using a method I have developed. Unlike monochrome distance fields, they have the ability
to reproduce sharp corners almost perfectly by utilizing all three color channels. to reproduce sharp corners almost perfectly by utilizing all three color channels.