numpy is no longer a build dependency

Author: alimanfoo

docs/index.rst

@@ -21,7 +21,7 @@ Highlights
 * Store arrays in memory, on disk, inside a Zip file, on S3, ... pretty much anywhere you like.
 * Read an array concurrently from multiple threads or processes.
 * Write to an array concurrently from multiple threads or processes.
-    
+
 Status
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@@ -32,10 +32,6 @@ tracker <https://github.com/alimanfoo/zarr/issues>`_.
 Installation
 ------------
 
-N.B., installation of Zarr requires that Numpy is already installed, e.g.::
-
-    $ pip install numpy
-
 Install Zarr from PyPI::
 
     $ pip install zarr