Document requirement on an api key from Googlefix/require_gmaps_apikey

Quoting from https://stackoverflow.com/q/2769148/37994162#37994162

 "As of June 22, 2016 Google Maps V3 no longer supports keyless access
  so you need to get a key for every (referrer-)domain which has never
  had a Google Map on it before."

The same answer also helpfully mentions how to obtain one.

1 files changed, 2 insertions, 2 deletions

diff --git a/config.php b/config.php
index e1f1a9c..20ff418 100755
--- a/config.php
+++ b/config.php
@@ -22,8 +22,8 @@ $version = "0.1";
 
 $mapapi = "gmaps";
 
-// you may set your google maps api key
-// this is not obligatory by now
+// you need to obtain and set a google maps api key
+// if using the gmaps mapapi.
 // $gkey = "AIzaSyC2CYwhwpM2NLhTm6L6ZKg9-SBpvft4P4U";
 
 // MySQL config