Synchronize Makefile.common from prometheus/prometheus (#1346)

* makefile: update Makefile.common with newer version

Signed-off-by: prombot <prometheus-team@googlegroups.com>

* Remove obsolete release tool.

Signed-off-by: Ben Kochie <superq@gmail.com>

.circleci/config.yml

@@ -96,9 +96,6 @@ jobs:
     - setup_remote_docker:
         version: 18.06.0-ce
     - run: docker run --privileged linuxkit/binfmt:v0.6
-    - run: mkdir -v -p ${HOME}/bin
-    - run: curl -L 'https://github.com/aktau/github-release/releases/download/v0.7.2/linux-amd64-github-release.tar.bz2' | tar xvjf - --strip-components 3 -C ${HOME}/bin
-    - run: echo 'export PATH=${HOME}/bin:${PATH}' >> ${BASH_ENV}
     - attach_workspace:
         at: .
     - run: make promu

Makefile.common

@@ -69,7 +69,7 @@ else
 	GO_BUILD_PLATFORM ?= $(GOHOSTOS)-$(GOHOSTARCH)
 endif
 
-PROMU_VERSION ?= 0.3.0
+PROMU_VERSION ?= 0.4.0
 PROMU_URL     := https://github.com/prometheus/promu/releases/download/v$(PROMU_VERSION)/promu-$(PROMU_VERSION).$(GO_BUILD_PLATFORM).tar.gz
 
 GOLANGCI_LINT :=