fix readme.md makefile change

Makefile

@@ -174,7 +174,7 @@ endif
 
 all_done: test_build
 	@if [ ! "`which clang 2>/dev/null`" = "" ]; then echo "[+] LLVM users: see llvm_mode/README.llvm for a faster alternative to afl-gcc."; fi
-	@echo "[+] All done! Be sure to review the README - it's pretty short and useful."
+	@echo "[+] All done! Be sure to review the README.md - it's pretty short and useful."
 	@if [ "`uname`" = "Darwin" ]; then printf "\nWARNING: Fuzzing on MacOS X is slow because of the unusually high overhead of\nfork() on this OS. Consider using Linux or *BSD. You can also use VirtualBox\n(virtualbox.org) to put AFL inside a Linux or *BSD VM.\n\n"; fi
 	@! tty <&1 >/dev/null || printf "\033[0;30mNOTE: If you can read this, your terminal probably uses white background.\nThis will make the UI hard to read. See docs/status_screen.txt for advice.\033[0m\n" 2>/dev/null
 
@@ -210,7 +210,7 @@ endif
 
 	install -m 755 afl-as $${DESTDIR}$(HELPER_PATH)
 	ln -sf afl-as $${DESTDIR}$(HELPER_PATH)/as
-	install -m 644 docs/README docs/ChangeLog docs/*.txt $${DESTDIR}$(DOC_PATH)
+	install -m 644 docs/README.md docs/ChangeLog docs/*.txt $${DESTDIR}$(DOC_PATH)
 	cp -r testcases/ $${DESTDIR}$(MISC_PATH)
 	cp -r dictionaries/ $${DESTDIR}$(MISC_PATH)
 
@@ -221,7 +221,7 @@ publish: clean
 #	  tar -cvz -f ~/www/afl/releases/$(PROGNAME)-$(VERSION).tgz $(PROGNAME)-$(VERSION)
 #	chmod 644 ~/www/afl/releases/$(PROGNAME)-$(VERSION).tgz
 #	( cd ~/www/afl/releases/; ln -s -f $(PROGNAME)-$(VERSION).tgz $(PROGNAME)-latest.tgz )
-#	cat docs/README >~/www/afl/README.txt
+#	cat docs/README.md >~/www/afl/README.txt
 #	cat docs/status_screen.txt >~/www/afl/status_screen.txt
 #	cat docs/historical_notes.txt >~/www/afl/historical_notes.txt
 #	cat docs/technical_details.txt >~/www/afl/technical_details.txt