build: remove Dep references in Makefile

Makefile

@@ -9,7 +9,7 @@ GOFLAGS=-a \
 	-gcflags "-trimpath ${GOPATH}" \
 	-asmflags "-trimpath ${GOPATH}"
 	
-SOURCES=client/ Gopkg.lock Gopkg.toml Makefile Config.go main.go nmdc-webfrontend.conf.SAMPLE
+SOURCES=client/ go.mod go.sum Makefile Config.go main.go nmdc-webfrontend.conf.SAMPLE
 
 .PHONY: all deps clean
 
@@ -18,8 +18,6 @@ all: $(BINNAME)-$(VERSION)-win32.7z $(BINNAME)-$(VERSION)-linux64.tar.xz $(BINNA
 deps:
 	npm install -g less uglify-js less-plugin-clean-css html-minifier
 	go get -u github.com/jteeuwen/go-bindata/...
-	go get -u github.com/golang/dep/cmd/dep
-	dep ensure
 	
 clean:
 	rm -f ./$(BINNAME)