Update README.

README.md

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 # walkshed.js
 
-walkshed.js is a prototype that demonstrates how raster analysis can be used to measure pedestrian access in a city. It relies on HTML5 canvas, utilizes [costdistance.js](https://github.com/atogle/costdistance.js), [tile-stitcher.js](https://github.com/atogle/tile-stitcher.js), and [Leaflet.js](https://github.com/CloudMade/Leaflet), and uses [TileMill](http://mapbox.com/tilemill/) to generate the data tiles.
+walkshed.js is a prototype that demonstrates how raster analysis can be used to measure pedestrian access in a city. It relies on HTML5 canvas, utilizes [mapalgebra.js](https://github.com/atogle/mapalgebra.js), [globalmaptiles.js](https://github.com/atogle/globalmaptiles.js), and [Leaflet.js](https://github.com/Leaflet/Leaflet), and uses [Mapbox Studio](http://mapbox.com/) to generate the data tiles.
 
 Run index.html on any web server to run the app locally.