docs: Update README.md

README.md

@@ -16,7 +16,7 @@ Because I want an easy way to see where my disk is being used.
 Study the above picture. 
 
 * We see `target` has 1.8G
-* `target/debug` is the same size as `target` - so we know nearly all the disk usage of the 1.5G is in this folder
+* `target/debug` is the same size as `target` - so we know nearly all the disk usage of the 1.8G is in this folder
 * `target/debug/deps` this is 1.2G - Note the bar jumps down to 70% to indicate that most disk usage is here but not all.
 * `target/debug/deps/dust-e78c9f87a17f24f3` - This is the largest file in this folder, but it is only 46M - Note the bar jumps down to 3% to indicate the file is small.