Fix README typo

README.md

@@ -13,7 +13,7 @@ Use the `addLine()` or `addLines()` methods to do so.
 
 You can align text left, center, or right. Use the `startX` and `startY` variables
 to position the text. If you use left or center alignment, these coordinates
-represent the top-left position of the text bonding box. If you use right
+represent the top-left position of the text bounding box. If you use right
 alignment, these coordinates represent the top-right position of the text bounding box.
 
 ## Style