Fix linkification

Author: mxstbr

shared/normalize-url.js

@@ -1,14 +1,14 @@
 // @flow
 
-const PROTOCOL = /(http(s?)):\/\//gi;
+const STARTS_WITH_PROTOCOL = /^https?:\/\//i;
 
-const addProtocolToString = (string: string) => {
-  // if the string starts with http or https, we are good
-  if (PROTOCOL.test(string)) {
-    return string;
+// Note(@mxstbr): This method assumes that a string passed into it is already verified to be an URL
+// it'll just append https:// to anything that doesn't look like an URL
+const addProtocolToString = (url: string) => {
+  if (STARTS_WITH_PROTOCOL.test(url)) {
+    return url;
   } else {
-    // otherwise it doesn't start with a protocol, prepend http
-    return `http://${string}`;
+    return `https://${url}`;
   }
 };