Add link to rate-limit discussion in rate-limit error (#181)

Author: DenverCoder1

src/card.php

@@ -307,10 +307,11 @@ function convertSvgToPng(string $svg): string
     $svg = trim($svg);
 
     // remove style and animations
-    $svg = preg_replace('/(<style>\X*<\/style>)/m', '', $svg);
+    $svg = preg_replace('/(<style>\X*?<\/style>)/m', '', $svg);
     $svg = preg_replace('/(opacity: 0;)/m', 'opacity: 1;', $svg);
     $svg = preg_replace('/(animation: fadein.*?;)/m', 'opacity: 1;', $svg);
     $svg = preg_replace('/(animation: currentstreak.*?;)/m', 'font-size: 28px;', $svg);
+    $svg = preg_replace('/<a href\X*?>(\X*?)<\/a>/m', '\1', $svg);
 
     // create canvas
     $imagick = new Imagick();

src/stats.php

@@ -67,7 +67,7 @@ function getContributionDates(array $contributionGraphs): array
     foreach ($contributionGraphs as $graph) {
         // if HTML contains "Please wait", we are being rate-limited
         if (strpos($graph, "Please wait") !== false) {
-            throw new AssertionError("Oh no! We are being rate-limited!");
+            throw new AssertionError("We are being rate-limited! Check <a href='https://git.io/streak-ratelimit' font-weight='bold'>git.io/streak-ratelimit</a> for details.");
         }
         // split into lines
         $lines = explode("\n", $graph);