Add login.gov provider

* add example for new login.gov provider
* sort example providers alphabetically

examples/main.go

@@ -40,6 +40,7 @@ import (
 	"github.com/markbates/goth/providers/lastfm"
 	"github.com/markbates/goth/providers/line"
 	"github.com/markbates/goth/providers/linkedin"
+	"github.com/markbates/goth/providers/logingov"
 	"github.com/markbates/goth/providers/meetup"
 	"github.com/markbates/goth/providers/microsoftonline"
 	"github.com/markbates/goth/providers/naver"
@@ -142,8 +143,17 @@ func main() {
 		goth.UseProviders(openidConnect)
 	}
 
+	logingov, _ := logingov.New(os.Getenv("LOGINGOV_ISSUER_ID"), os.Getenv("LOGINGOV_REDIRECT_URI"), os.Getenv("LOGINGOV_AUTODISCOVERY_URL"))
+	if logingov != nil {
+		goth.UseProviders(logingov)
+	}
+
 	m := make(map[string]string)
 	m["amazon"] = "Amazon"
+	m["apple"] = "Apple"
+	m["auth0"] = "Auth0"
+	m["azuread"] = "Azure AD"
+	m["battlenet"] = "Battlenet"
 	m["bitbucket"] = "Bitbucket"
 	m["box"] = "Box"
 	m["dailymotion"] = "Dailymotion"
@@ -159,43 +169,40 @@ func main() {
 	m["gitlab"] = "Gitlab"
 	m["google"] = "Google"
 	m["gplus"] = "Google Plus"
-	m["shopify"] = "Shopify"
-	m["soundcloud"] = "SoundCloud"
-	m["spotify"] = "Spotify"
-	m["steam"] = "Steam"
-	m["stripe"] = "Stripe"
-	m["twitch"] = "Twitch"
-	m["uber"] = "Uber"
-	m["wepay"] = "Wepay"
-	m["yahoo"] = "Yahoo"
-	m["yammer"] = "Yammer"
 	m["heroku"] = "Heroku"
 	m["instagram"] = "Instagram"
 	m["intercom"] = "Intercom"
 	m["kakao"] = "Kakao"
 	m["lastfm"] = "Last FM"
-	m["linkedin"] = "Linkedin"
 	m["line"] = "LINE"
-	m["onedrive"] = "Onedrive"
-	m["azuread"] = "Azure AD"
+	m["linkedin"] = "Linkedin"
+	m["login.gov"] = "login.gov"
+	m["meetup"] = "Meetup.com"
 	m["microsoftonline"] = "Microsoft Online"
-	m["battlenet"] = "Battlenet"
+	m["naver"] = "Naver"
+	m["nextcloud"] = "NextCloud"
+	m["onedrive"] = "Onedrive"
+	m["openid-connect"] = "OpenID Connect"
 	m["paypal"] = "Paypal"
-	m["twitter"] = "Twitter"
 	m["salesforce"] = "Salesforce"
-	m["typetalk"] = "Typetalk"
+	m["seatalk"] = "SeaTalk"
+	m["shopify"] = "Shopify"
 	m["slack"] = "Slack"
-	m["meetup"] = "Meetup.com"
-	m["auth0"] = "Auth0"
-	m["openid-connect"] = "OpenID Connect"
-	m["xero"] = "Xero"
+	m["soundcloud"] = "SoundCloud"
+	m["spotify"] = "Spotify"
+	m["steam"] = "Steam"
+	m["strava"] = "Strava"
+	m["stripe"] = "Stripe"
+	m["twitch"] = "Twitch"
+	m["twitter"] = "Twitter"
+	m["typetalk"] = "Typetalk"
+	m["uber"] = "Uber"
 	m["vk"] = "VK"
-	m["naver"] = "Naver"
+	m["wepay"] = "Wepay"
+	m["xero"] = "Xero"
+	m["yahoo"] = "Yahoo"
+	m["yammer"] = "Yammer"
 	m["yandex"] = "Yandex"
-	m["nextcloud"] = "NextCloud"
-	m["seatalk"] = "SeaTalk"
-	m["apple"] = "Apple"
-	m["strava"] = "Strava"
 
 	var keys []string
 	for k := range m {

go.mod

@@ -18,3 +18,5 @@ require (
 	golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f // indirect
 	google.golang.org/appengine v1.2.0 // indirect
 )
+
+go 1.13