Fixed link in pull request template
Closes:
@@ -18,4 +18,4 @@ The project is undergoing daily changes. Pull Requests will be reviewed and resp
## Related PRs
-(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/diem/diem/developers.libra.org, and link to your PR here.)
+(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/diem/diem/tree/master/developers.diem.com, and link to your PR here.)
