Update VISION.md

Fix broken links

VISION.md

@@ -31,7 +31,7 @@ great place to be for a developer tool.
 # Why Danger JS? What about Danger Ruby?
 
 When I started Danger JS, Danger Ruby was two years old, is still doing just fine. See the
-[original vision file](https://github.com/danger/danger/blob/main/VISION.md). This document assumes you have read it.
+[original vision file](https://github.com/danger/danger/blob/master/VISION.md). This document assumes you have read it.
 
 The amount of issues we get in comparison to the number of downloads on Rubygems makes me feel pretty confident about
 Danger Ruby's state of production quality and maturity. I wanted to start thinking about the larger patterns in software
@@ -48,7 +48,7 @@ This realization came at the same time as serious thinking on a hosted version o
 can limit the exposed Danger DSL to only something that can be obtained over the API remotely. By doing this, a hosted
 Danger does not need to clone and run the associated projects. This is essential for my sanity. I cannot run multiple
 [servers like CocoaDocs](http://cocoadocs.org). So far, I'm calling this Peril. You can consult the
-[vision file for Peril](https://github.com/danger/peril/blob/main/VISION.md) if you'd like.
+[vision file for Peril](https://github.com/danger/peril/blob/master/VISION.md) if you'd like.
 
 [plugins]: https://www.npmjs.com/search?q=keywords:danger-plugin&page=1&ranking=optimal
 [peril]: http://artsy.github.io/blog/2017/09/04/Introducing-Peril/