Move chat to spectrum

contributing.md

@@ -34,22 +34,22 @@ help you faster.
 
 ## Questions
 
-Please chat and ask questions on Gitter! Jump in there and lurk, talk to us,
+Please chat and ask questions on spectrum! Jump in there and lurk, talk to us,
 and help others.
 
-* [**unified**](https://gitter.im/unifiedjs/Lobby)
+* [**unified**](https://spectrum.chat/unified/unified)
  — Topics relating to [**unified**][unified] in general
-* [**vfile**](https://gitter.im/vfile/Lobby)
+* [**vfile**](https://spectrum.chat/unified/vfile)
  — Topics relating to [**vfile**][vfile]: virtual files
-* [**syntax-tree**](https://gitter.im/syntax-tree/Lobby)
+* [**syntax-tree**](https://spectrum.chat/unified/syntax-tree)
  — Topics relating to [**syntax-tree**][syntax-tree] and [**unist**][unist]
-* [**remark**](https://gitter.im/remarkjs/Lobby)
+* [**remark**](https://spectrum.chat/unified/remark)
  — Topics relating to the [**remark**][remark] ecosystem, markdown,
  and [**mdast**][mdast]
-* [**rehype**](https://gitter.im/rehypejs/Lobby)
+* [**rehype**](https://spectrum.chat/unified/rehype)
  — Topics relating to the [**rehype**][rehype] ecosystem, HTML,
  and [**hast**][hast]
-* [**retext**](https://gitter.im/retextjs/Lobby)
+* [**retext**](https://spectrum.chat/unified/retext)
  — Topics relating to the [**retext**][retext] ecosystem, natural language,
  and [**nlcst**][nlcst]
 

readme.md

@@ -399,7 +399,7 @@ By interacting with this repository, organisation, or community you agree to
 abide by its terms.
 
 Want to chat with the community and contributors?
-Join us in [Gitter][chat]!
+Join us in [spectrum][chat]!
 
 Have an idea for a cool new utility or tool?
 That’s great!
@@ -468,7 +468,7 @@ This work is licensed under a
 
 [ideas]: https://github.com/syntax-tree/ideas
 
-[chat]: https://gitter.im/syntax-tree/Lobby
+[chat]: https://spectrum.chat/unified/syntax-tree
 
 [license]: https://creativecommons.org/licenses/by/4.0/