Normalize whitespace in Makefile

Makefile

@@ -1,16 +1,20 @@
 REBAR?=./rebar
 
+
 all: build
 
+
 clean:
 	$(REBAR) clean
 	rm -rf logs
 	rm -rf .eunit
 	rm -f test/*.beam
 
+
 distclean: clean
 	git clean -fxd
 
+
 depends:
 	@if test ! -d ./deps; then \
 		$(REBAR) get-deps; \