Update README.md

Ammended Research Group name

Author: nedtaylor

README.md

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 Ab Initio Restructuring Tool Enabling Modelling of Interface Structures
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 by Ned Thaddeus Taylor and Steven Paul Hepplestone  
-The ARTEMIS Research Group
+The ARTEMIS Research Group (Hepplestone Research Group)
 
 
 ARTEMIS is a software package for the generation and modelling of interfaces between materials.