vendor: update all dependencies

vendor/github.com/mattn/go-ieproxy/proxy_middleman_windows.go

@@ -0,0 +1,52 @@
+package ieproxy
+
+import (
+	"net/http"
+	"net/url"
+
+	"golang.org/x/net/http/httpproxy"
+)
+
+func proxyMiddleman() func(req *http.Request) (i *url.URL, e error) {
+	// Get the proxy configuration
+	conf := GetConf()
+	envcfg := httpproxy.FromEnvironment()
+
+	if envcfg.HTTPProxy != "" || envcfg.HTTPSProxy != "" {
+		// If the user manually specifies environment variables, prefer those over the Windows config.
+		return http.ProxyFromEnvironment
+	}
+
+	return func(req *http.Request) (i *url.URL, e error) {
+		if conf.Automatic.Active {
+			host := conf.Automatic.FindProxyForURL(req.URL.String())
+			if host != "" {
+				return &url.URL{Host: host}, nil
+			}
+		}
+		if conf.Static.Active {
+			return staticProxy(conf, req)
+		}
+		// Should return no proxy; fallthrough.
+		return http.ProxyFromEnvironment(req)
+	}
+}
+
+func staticProxy(conf ProxyConf, req *http.Request) (i *url.URL, e error) {
+	// If static proxy obtaining is specified
+	prox := httpproxy.Config{
+		HTTPSProxy: mapFallback("https", "", conf.Static.Protocols),
+		HTTPProxy:  mapFallback("http", "", conf.Static.Protocols),
+		NoProxy:    conf.Static.NoProxy,
+	}
+	return prox.ProxyFunc()(req.URL)
+}
+
+// Return oKey or fbKey if oKey doesn't exist in the map.
+func mapFallback(oKey, fbKey string, m map[string]string) string {
+	if v, ok := m[oKey]; ok {
+		return v
+	} else {
+		return m[fbKey]
+	}
+}