Update dotenv with new link (#461)

jamiebrynes7 · web-flow · commit 47916da2490f · 2018-10-08T21:03:12.000+01:00
#### Description
Required for docs linting + link checking to work properly
#### Tests
Ran docs linter
#### Documentation
N/A
#### Primary reviewers
If your change will take a long time to review, you can name at most two primary reviewers who are ultimately responsible for reviewing this request. @ mention them.
diff --git a/.env b/.env
@@ -1 +1 @@
-GITHUB_URL=github.com/spatialos/UnityGDK
+GITHUB_URL=github.com/spatialos/gdk-for-unity

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-GITHUB_URL=github.com/spatialos/UnityGDK`
	`1`	`+GITHUB_URL=github.com/spatialos/gdk-for-unity`