Merge pull request #307 from shurcooL/use-https

gosrc: Use https to get list of valid TLDs.
diff --git a/gosrc/gen.go b/gosrc/gen.go
index 3c9f791..3f74265 100644
--- a/gosrc/gen.go
+++ b/gosrc/gen.go
@@ -83,7 +83,7 @@
 
 	// Get list of valid TLDs.
 
-	resp, err := http.Get("http://data.iana.org/TLD/tlds-alpha-by-domain.txt")
+	resp, err := http.Get("https://data.iana.org/TLD/tlds-alpha-by-domain.txt")
 	if err != nil {
 		log.Fatal(err)
 	}