Remove duplicate code in Makefile (#99)

Signed-off-by: minchao <[email protected]>

Makefile

@@ -32,16 +32,6 @@ sdk:
 		rm -rf ./sdk/php/swagger/test
 		rm -rf ./vendor
 
-install-stable:
-		KETO_LATEST=$$(git describe --abbrev=0 --tags)
-		git checkout $$KETO_LATEST
-		$(go env GOPATH)/bin/packr
-		GO111MODULE=on go install \
-				-ldflags "-X github.com/ory/keto/cmd.Version=$$KETO_LATEST -X github.com/ory/keto/cmd.BuildTime=`TZ=UTC date -u '+%Y-%m-%dT%H:%M:%SZ'` -X github.com/ory/keto/cmd.GitHash=`git rev-parse HEAD`" \
-				.
-		$(go env GOPATH)/bin/packr clean
-		git checkout master
-
 .PHONY: install-stable
 install-stable:
 		KETO_LATEST=$$(git describe --abbrev=0 --tags)
@@ -57,4 +47,4 @@ install-stable:
 install:
 		$(go env GOPATH)/bin/packr
 		GO111MODULE=on go install .
-		$(go env GOPATH)/bin/packr clean
+		$(go env GOPATH)/bin/packr clean