Makefile: fix VERSION_FLAGS (mgechev#667)

Since 1c28383 build info variables
are defined in "github.com/mgechev/revive/cli", not "main".

Fixes mgechev#666

Makefile

@@ -6,7 +6,7 @@ GIT_COMMIT ?= $(shell git rev-parse --verify HEAD)
 GIT_VERSION ?= $(shell git describe --tags --always --dirty="-dev")
 DATE ?= $(shell date -u '+%Y-%m-%d %H:%M UTC')
 BUILDER ?= Makefile
-VERSION_FLAGS := -X "main.version=$(GIT_VERSION)" -X "main.date=$(DATE)" -X "main.commit=$(GIT_COMMIT)" -X "main.builtBy=$(BUILDER)"
+VERSION_FLAGS := -X "github.com/mgechev/revive/cli.version=$(GIT_VERSION)" -X "github.com/mgechev/revive/cli.date=$(DATE)" -X "github.com/mgechev/revive/cli.commit=$(GIT_COMMIT)" -X "github.com/mgechev/revive/cli.builtBy=$(BUILDER)"
 
 install:
 	@go mod vendor