Updated RijksMuseum Doc Link

The previous link was redirected to the website of the museum. Which had no documentation or reference to the APIs.

README.md

@@ -193,7 +193,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Noun Project](http://api.thenounproject.com/index.html) | Icons | `OAuth` | No | Unknown |
 | [PHP-Noise](https://php-noise.com/) | Noise Background Image Generator | No | Yes | Yes |
 | [Pixel Encounter](https://pixelencounter.com/api) | SVG Icon Generator | No | Yes | No |
-| [Rijksmuseum](https://www.rijksmuseum.nl/en/api) | Art | `apiKey` | Yes | Unknown |
+| [Rijksmuseum](https://data.rijksmuseum.nl/object-metadata/api/) | RijksMuseum Data | `apiKey` | Yes | Unknown |
 | [Word Cloud](https://wordcloudapi.com/) | Easily create word clouds | `apiKey` | Yes | Unknown |
 
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