append to revisions file with newline

Makefile

@@ -10,7 +10,7 @@ install:
 	go install github.com/tendermint/tendermint/cmd/debora
 	go install github.com/tendermint/tendermint/cmd/stdinwriter
 	go install github.com/tendermint/tendermint/cmd/logjack
-	@echo -n `git rev-parse --verify HEAD` >> $(TMROOT)/revisions
+	@echo `git rev-parse --verify HEAD` >> $(TMROOT)/revisions
 
 build: 
 	go build -o build/tendermint github.com/tendermint/tendermint/cmd/tendermint
@@ -48,4 +48,4 @@ gen_client:
 	go generate rpc/core_client/*.go
 
 revision:
-	@echo -n `git rev-parse --verify HEAD` >> $(TMROOT)/revisions
+	@echo `git rev-parse --verify HEAD` >> $(TMROOT)/revisions