Fixed the broken link in readme.md (#3409)

README.md

@@ -132,7 +132,7 @@ Adopters
 | [Tailwind](https://www.tailwindapp.com/) | ![tailwind](docs/src/readme_images/tailwind.png) | Media | Post interesting and relevant content to Pinterest. |
 | [Issuu](https://issuu.com/) | ![issuu](docs/src/readme_images/issuu.png) | Media | Gensim's LDA module lies at the very core of the analysis we perform on each uploaded publication to figure out what it's all about. |
 | [Search Metrics](http://www.searchmetrics.com/) | ![search-metrics](docs/src/readme_images/search-metrics.png) | Content Marketing | Gensim word2vec used for entity disambiguation in Search Engine Optimisation. |
-| [12K Research](https://12k.co/) | ![12k](docs/src/readme_images/12k.png)| Media |   Document similarity analysis on media articles. |
+| [12K Research](https://12k.com/) | ![12k](docs/src/readme_images/12k.png)| Media |   Document similarity analysis on media articles. |
 | [Stillwater Supercomputing](http://www.stillwater-sc.com/) | ![stillwater](docs/src/readme_images/stillwater.png) | Hardware | Document comprehension and association with word2vec. |
 | [SiteGround](https://www.siteground.com/) |  ![siteground](docs/src/readme_images/siteground.png) | Web hosting | An ensemble search engine which uses different embeddings models and similarities, including word2vec, WMD, and LDA. |
 | [Capital One](https://www.capitalone.com/) | ![capitalone](docs/src/readme_images/capitalone.png) | Finance | Topic modeling for customer complaints exploration. |