Added git hash to version number

makefile

@@ -6,6 +6,8 @@ FLAGS += -Wall
 FLAGS += -Wextra
 FLAGS += -Werror
 
+GITFLAG = -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'
+
 OBJDIR = obj
 OUTDIR = out
 
@@ -43,13 +45,18 @@ $(OUTDIR)/connect4_%.elf: $(addprefix $(OBJDIR)/,ui_%.o logic.o connect4.o LICEN
 $(OBJDIR)/LICENSE.o: LICENSE
 	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
-	ld -r -b binary -o $@ $^ 
+	ld -r -b binary -o $@ $^
 
 $(OBJDIR)/%.o: %.c
 	@echo $(MSG_COMPILING) $^
 	@mkdir -p $(@D)
 	$(CC) -c $(FLAGS) -o $@ $^
 
+$(OBJDIR)/connect4.o: connect4.c
+	@echo $(MSG_COMPILING) $^
+	@mkdir -p $(@D)
+	$(CC) -c $(FLAGS) $(GITFLAG) -o $@ $^
+
 clean:
 	@echo $(MSG_CLEANING)
 	@echo $(MSG_CLEANING_OBJ)