Fixed typo in README.md

Author: RyanHilbert

README.md

@@ -1,5 +1,5 @@
 # Diffraction Simulation Toolkit
-The Diffraction Simulation Toolkit allows simulation of dynamical diffraction experiements via a user-friendly graphical interface.
+The Diffraction Simulation Toolkit allows simulation of dynamical diffraction experiments via a user-friendly graphical interface.
 
 ## Installation
 This software is made available as a standalone executable (.exe) file on Windows and as a Debian source package (.dsc) elsewhere.