typo (lastex -> latex)

git-latexdiff

@@ -100,7 +100,7 @@ Options:
     --ignore-makefile     ignore the Makefile, build as though it doesn't exist
     -*                    other options are passed directly to latexdiff
     --bbl                 shortcut to flatten a bbl file of the same name as the project
-    --latexpand           pass options to lastexpand (should be last option specified)
+    --latexpand           pass options to latexpand (should be last option specified)
     --latexdiff-flatten   use --flatten from latexdiff instead of latexpand
 EOF
 }