Updated readme notice

Author: dnrobin

README.md

@@ -5,7 +5,7 @@ Arrayed waveguide grating (AWG) simulator designed as a series of functional blo
 ## Version history
 
 ### Vesrion 0.8 (Oct 23, 2020)
-* added packaged Matlab APP
+* added packaged Matlab App
 * simplified overall project structure
 * fixed some incorrect math equations