patch 8.1.2086: missing a few changes for the renamed files

Problem:    Missing a few changes for the renamed files.
Solution:   Rename in a few more places. (Ken Takata)
diff --git a/nsis/README.txt b/nsis/README.txt
index 6ecc579..cd4d52e 100644
--- a/nsis/README.txt
+++ b/nsis/README.txt
@@ -14,7 +14,7 @@
 	gvim.exe (the OLE version),
 	vimrun.exe,
 	install.exe,
-	uninstal.exe,
+	uninstall.exe,
 	tee/tee.exe,
 	xxd/xxd.exe,