Call the project a save editor instead of save manipulator

The latter is a more common keyword, helping people find it when they are looking for a save editor.

README.md

@@ -1,4 +1,4 @@
 # Flowey's Time Machine
-Undertale SAVE manipulator
+Undertale SAVE editor
 
 http://crumblingstatue.github.io/FloweysTimeMachine