Update documentation

doc.go

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+/*
+Package gmi implements the Gemini protocol.
+
+Send makes a Gemini request:
+
+	req := gmi.NewRequest("gemini://example.com")
+	err := gmi.Send(req)
+	if err != nil {
+		// handle error
+	}
+
+For control over client behavior, create a Client:
+
+	var client gmi.Client
+	err := client.Send(req)
+	if err != nil {
+		// handle error
+	}
+
+The default client loads known hosts from "$XDG_DATA_HOME/gemini/known_hosts".
+Custom clients can load their own list of known hosts:
+
+	err := client.KnownHosts.LoadFrom("path/to/my/known_hosts")
+	if err != nil {
+		// handle error
+	}
+
+Clients can control when to trust certificates with TrustCertificate:
+
+	client.TrustCertificate = func(hostname string, cert *x509.Certificate, knownHosts *gmi.KnownHosts) error {
+		return knownHosts.Lookup(hostname, cert)
+	}
+
+If a server responds with StatusCertificateRequired, the default client will generate a certificate and resend the request with it. Custom clients can specify GetCertificate:
+
+	client.GetCertificate = func(hostname string, store *gmi.CertificateStore) *tls.Certificate {
+		// If the certificate is in the store, return it
+		if cert, err := store.Lookup(hostname); err == nil {
+			return &cert
+		}
+		// Otherwise, generate a certificate
+		duration := time.Hour
+		cert, err := gmi.NewCertificate(hostname, duration)
+		if err != nil {
+			return nil
+		}
+		// Store and return the certificate
+		store.Add(hostname, cert)
+		return &cert
+	}
+
+Server is a Gemini server.
+
+	var server gmi.Server
+
+Servers must be configured with certificates:
+
+	var server gmi.Server
+	server.CertificateStore.Load("/var/lib/gemini/certs")
+
+Servers can accept requests for multiple hosts and schemes:
+
+	server.HandleFunc("example.com", func(rw *gmi.ResponseWriter, req *gmi.Request) {
+		fmt.Fprint(rw, "Welcome to example.com")
+	})
+	server.HandleFunc("example.org", func(rw *gmi.ResponseWriter, req *gmi.Request) {
+		fmt.Fprint(rw, "Welcome to example.org")
+	})
+	server.HandleSchemeFunc("http", "example.net", func(rw *gmi.ResponseWriter, req *gmi.Request) {
+		fmt.Fprint(rw, "Proxied content from example.net")
+	})
+
+To start the server, call ListenAndServe:
+
+	err := server.ListenAndServe()
+	if err != nil {
+		// handle error
+	}
+*/
+package gmi