Fix make release-assets (#30)

Author: vearutop

makefiles/release-assets.mk

@@ -11,7 +11,7 @@ BUILD_DIR ?= ./bin
 
 export CGO_ENABLED ?= 0
 
-RELEASE_TARGETS ?= darwin/amd64 darwin/arm64 linux/amd64 linux/arm64 linux/arm32 windows/amd64
+RELEASE_TARGETS ?= "darwin/amd64 darwin/arm64 linux/amd64 linux/arm64 linux/arm32 windows/amd64"
 
 ## Build and compress binaries for release assets.
 release-assets: