Update README.md

Author: ZaunerM

README.md

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 # PolyGridWizZ_v0.0.1-beta
 Tested for Matlab 8.6.0.267246 (R2015b) and Matlab 9.4.0.813654 (R2018a)
 
-Polynomial Gridgeneration Wizzard for creating structured grids around airfoils with blunt and sharp trailing edges.
+Polynomial Gridgeneration Wizard for creating structured grids around airfoils with blunt and sharp trailing edges.
 
 Developed by Markus Zauner and Neil Sandham.