change installation of pigeon if off gopath

Makefile

@@ -46,7 +46,12 @@ install-build-deps: ## Install dependencies for bin build
 
 install-gen-deps: ## Install dependencies for code generation
 	@go get golang.org/x/tools/cmd/goimports
-	@go get -u github.com/mna/pigeon
+	@./scripts/off_gopath.sh; if [ $$? -eq 0 ]; then \
+		go get github.com/mna/pigeon@master; \
+	else \
+		go get -u github.com/mna/pigeon; \
+	fi
+
 	@go get github.com/alvaroloes/enumer
 
 dev: ## Build and install a development build

scripts/off_gopath.sh

@@ -0,0 +1,22 @@
+#! /usr/bin/env bash
+
+set -eu -o pipefail
+
+gpath=${GOPATH:-}
+if [ -z "$gpath" ]; then
+  gpath=$HOME/go
+fi
+
+reldir=`dirname $0`
+curdir=`pwd`
+cd $reldir
+CUR_GO_DIR=`pwd`
+cd $curdir
+
+if [[ $CUR_GO_DIR == *"$gpath"* ]]; then
+  # echo "You're on the gopath"
+  exit 1
+else
+  # echo "You're not on the gopath"
+  exit 0
+fi