fix typo

README.md

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 # The *SpHEAR Project
 
-The *SpHEAR (Spherical Harmonics Ear) Project is a collection of 3D models and ssociated code for building, testing and calibrating full surround Ambisonics microphones. All 3D models are written in Openscad with the code licensed under the GPL 3+ license (GNU Public License version 3 or higher), and the 3D models licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.
+The *SpHEAR (Spherical Harmonics Ear) Project is a collection of 3D models and associated code for building, testing and calibrating full surround Ambisonics microphones. All 3D models are written in Openscad with the code licensed under the GPL 3+ license (GNU Public License version 3 or higher), and the 3D models licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license.
 
 The 3D models are almost completely parametric and are designed to be able to be printed on low cost widely available 3D printers (at CCRMA we use an Ultimaker 2 Extended Plus printer, using PLA material). The design is modular and tries to avoid using overhangs and support structures. That is why each microphone assembly is made of a number of independently printed capsule holders interconnected by legs that interlock and hold the structure together. The capsule holders and the mount are glued together to create a 3D structure that securely holds all microphone capsules. A mount that can be clipped into a standard microphone stand is part of the design.