auth.NewProvider failure should be fatal

Author: Lachlan Donald

app/main.go

@@ -238,7 +238,7 @@ func Main(config Config) {
 
 		provider, err := auth.NewProvider(providerType, p)
 		if err != nil {
-			p.Tracef("Failed to create GitHub token provider: %v", err)
+			p.Fatalf("Failed to create GitHub token provider: %v", err)
 		} else {
 			token, err := provider.GetToken()
 			if err != nil {