Compilation prompts missing files

[jingguang0818]

` PS D:\gitee.com\go\go-webview> go build -ldflags="-H windowsgui"

github.com/webview/webview_go

In file included from D:/goRely/goPath/pkg/mod/github.com/webview/[email protected]/libs/webview/include/webview.h:2076, from webview.cc:1: D:/goRely/goPath/pkg/mod/github.com/webview/[email protected]/libs/mswebview2/include/WebView2.h:978:10: fatal error: EventToken.h: No such file or directory
#include "EventToken.h" ^~~~~~~~~~~~~~ compilation terminated. PS D:\gitee.com\go\go-webview> `

gcc version 8.1.0 (x86_64-posix-sjlj-rev0, Built by MinGW-W64 project)