Close #194. No branch name in build version anymore

Makefile

@@ -1,13 +1,11 @@
-BRANCH := `git rev-parse --abbrev-ref HEAD`
-
 .PHONY: dependencies install run
 
 build:
 	go build -o bin/wtf
 
 install:
-	which wtf | xargs rm || true
-	go install -ldflags="-X main.version=$(shell git describe --always --abbrev=6)_$(BRANCH) -X main.date=$(shell date +%FT%T%z)"
+	go clean
+	go install -ldflags="-X main.version=$(shell git describe --always --abbrev=6) -X main.date=$(shell date +%FT%T%z)"
 	which wtf
 
 run: build