Add missing bracket inside CONTRIBUTING.md notice (anuraghazra#2842)

Author: qwerty541

Diff for: CONTRIBUTING.md

@@ -53,7 +53,7 @@ All you need to do is edit the [themes/index.js](./themes/index.js) file and add
 > If you are contributing your theme just because you are using it personally, then you can [customize the looks](./readme.md#customization) of your card with URL params instead.
 
 > **Note**
-> Keep in mind that we already have a vast collection of different themes. To keep their number manageable, we began to add only themes supported by the community. Your pull request with theme addition will be merged once we get enough positive feedback from the community in the form of thumbs up (see [#1935](https://github.com/anuraghazra/github-readme-stats/issues/1935#top-themes-prs). Remember that you can also support themes of other contributors that you liked to speed up their merge.
+> Keep in mind that we already have a vast collection of different themes. To keep their number manageable, we began to add only themes supported by the community. Your pull request with theme addition will be merged once we get enough positive feedback from the community in the form of thumbs up (see [#1935](https://github.com/anuraghazra/github-readme-stats/issues/1935#top-themes-prs)). Remember that you can also support themes of other contributors that you liked to speed up their merge.
 
 ## Any contributions you make will be under the MIT Software License