typo

src/tilemapper/grid.py

@@ -7,7 +7,7 @@ Position = namedtuple("Position", ["y", "x", "value"])
 
 class Grid:
     """
-    A class wrapping a 2-d array arry of Position instances with some convience methods.
+    A class wrapping a 2-d array of Position instances with some convience methods.
     """
     def __init__(self, data):
         self.data = []