Fixed setuid and typo in Makefile, damn copy&paste

Makefile

@@ -18,7 +18,7 @@ sxiv:	$(OBJFILES)
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 install: all
-	install -D -m 4755 -o root -g root sxiv $(PREFIX)/bin/sxiv
+	install -D -m 755 -o root -g root sxiv $(PREFIX)/bin/sxiv
 	mkdir -p $(PREFIX)/share/man/man1
 	sed "s/VERSION/$(VERSION)/g" sxiv.1 > $(PREFIX)/share/man/man1/sxiv.1
 	chmod 644 $(PREFIX)/share/man/man1/sxiv.1

README.md

@@ -16,7 +16,7 @@ sxiv is built using the commands:
 
 Please note, that the latter one requires root privileges.
 By default, sxiv is installed using the prefix "/usr/local", so the full path
-of the executable will be "/usr/local/sbin/sxiv".
+of the executable will be "/usr/local/bin/sxiv".
 
 You can install it into a directory of your choice by changing the second
 command to: