Fix Makefile for use on Unix

The GCC version installed on Unix does not support `-Wpedantic`, so this
has been replaced with `-pedantic`.  The version installed on Unix is
4.0.0.

`.PHONY` has been removed as this has no special meaning on Unix.
Instead, make thought it was a target which made it build, run, then
immediately delete the executable.  This is obviously not desired.

Unix make also doesn't support the `$^` automatic variable.  This has
been replaced with the object list variable instead.

Makefile

@@ -1,7 +1,6 @@
-.PHONY: run test run clean
 
 CC=gcc
-CFLAGS=-Wall -Wpedantic -Werror -std=c99
+CFLAGS=-Wall -pedantic -Werror -std=c99
 
 OBJ=main.o lexer.o token.o node.o
 
@@ -11,10 +10,7 @@ run: readme
 	./readme
 
 readme: ${OBJ}
-	${CC} ${CFLAGS} -o $@ $^
-
-#token.o: token.h token.c
-#	${CC} ${CFLAGS} -o $@ $<
+	${CC} ${CFLAGS} -o $@ ${OBJ}
 
 .c.o:
 	${CC} ${CFLAGS} -c -o $@ $<