VSCODE go 1.12編譯錯誤Delve built by Go 1.11 or later

編譯錯誤信息：executables built by Go 1.11 or later need Delve built by Go 1.11 or later

這個是因爲delve版本太老，需要更新，更新命令如下：

go get -v -u /Users/mac/go/src/github.com/go-delve/delve/cmd/dlv