Added arm64 build target

Makefile

@@ -1,48 +1,62 @@
 
-.PHONY: setup build resources lint clean
-
 VERSION = $(shell git describe --always --dirty)
 TIMESTAMP = $(shell git show -s --format=%ct)
 
 default: build
 
+.PHONY: setup
 setup: 
 	go get -u github.com/jteeuwen/go-bindata/...
 
+.PHONY: resources
 resources:
 	go-bindata -pkg resources -o internal/resources/resources.go resources/...
 
+.PHONY: build
 build:
 	go build -o ./build/gopow *.go
 
-all: build_darwin build_linux build_arm5 build_arm7 build_win64 build_win32
+.PHONY: all
+all: build_darwin_x86 build_darwin_arm64 build_linux build_arm5 build_arm7 build_win64 build_win32
 	rm ./build/gopow
 	rm ./build/gopow.exe
 
-build_darwin:
+.PHONY: build_darwin_x86
+build_darwin_x86:
 	GOOS=darwin GOARCH=amd64 go build -a -o ./build/gopow *.go
-	zip ./build/gopow_darwin64.zip ./build/gopow
+	zip ./build/gopow_darwin_amd64.zip ./build/gopow
 
+.PHONY: build_darwin_arm64
+build_darwin_arm64:
+	GOOS=darwin GOARCH=arm64 go build -a -o ./build/gopow *.go
+	zip ./build/gopow_darwin_arm64.zip ./build/gopow
+
+.PHONY: build_linux
 build_linux:
 	GOOS=linux GOARCH=amd64 go build -a -o ./build/gopow *.go
-	zip ./build/gopow_linux64.zip ./build/gopow
+	zip ./build/gopow_linux_amd64.zip ./build/gopow
 
+.PHONY: build_arm5
 build_arm5:
 	GOOS=linux GOARM=5 GOARCH=arm go build -a -o ./build/gopow *.go
 	zip ./build/gopow_linux_arm5.zip ./build/gopow
 
+.PHONY: build_arm7
 build_arm7:
 	GOOS=linux GOARM=7 GOARCH=arm go build -a -o ./build/gopow *.go
 	zip ./build/gopow_linux_arm7.zip ./build/gopow
 
+.PHONY: build_win64
 build_win64:
 	GOOS=windows GOARCH=amd64 go build -a -o ./build/gopow.exe *.go
 	zip ./build/gopow_win64.zip ./build/gopow.exe
 
+.PHONY: build_win32
 build_win32:
 	GOOS=windows GOARCH=386 go build -a -o ./build/gopow.exe *.go
 	zip ./build/gopow_win32.zip ./build/gopow.exe
 
+.PHONY: clean
 clean:
 	- rm -r build
 	- rm -rf internal/resources