fixed typo

src/nonTerminal.py

@@ -92,7 +92,7 @@ class NonTerminal:
                     self.__addAtomToFirstSet(innerAtom)
 
     def getFirstSet(self):
-        if self.__firstSetIsGenrated == False:
+        if self.__firstSetIsGenerated == False:
             self.generateFirstSet();
 
         return self.__first