adjust maintainers + add @benknoble in README.md

Author: dsifford

README.md

@@ -6,16 +6,17 @@
 
 ## Install
 
-All instructions can be found at [draculatheme.com/vim](https://draculatheme.com/vim).
-
+All instructions can be found at
+[draculatheme.com/vim](https://draculatheme.com/vim).
 
 ## Team
 
-This theme is maintained by the following person(s) and a bunch of [awesome contributors](https://github.com/dracula/vim/graphs/contributors).
+This theme is maintained by the following person(s) and a bunch of
+[awesome contributors](https://github.com/dracula/vim/graphs/contributors).
 
-[![Trevor Heins](https://avatars0.githubusercontent.com/u/1607028?v=3&s=70)](https://github.com/heinst) | [![Blake Williams](https://avatars0.githubusercontent.com/u/342554?v=3&s=70)](https://github.com/BlakeWilliams) | [![Derek S.](https://avatars3.githubusercontent.com/u/5240018?v=3&s=70)](https://github.com/dsifford)
---- | --- | ---
-[Trevor Heins](https://github.com/heinst) | [Blake Williams](https://github.com/BlakeWilliams) | [Derek S.](https://github.com/dsifford)
+| [![Derek S.](https://avatars3.githubusercontent.com/u/5240018?v=3&s=70)](https://github.com/dsifford) | [![David Ben Knoble](https://avatars3.githubusercontent.com/u/22802209?v=3&s=70)](https://github.com/benknoble) |
+| ----------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------- |
+| [Derek S.](https://github.com/dsifford)                                                               | [David Ben Knoble](https://github.com/benknoble)                                                                |
 
 ## License