Update pull_request_template.md (#941)

Author: dingsdax

.github/pull_request_template.md

@@ -10,4 +10,4 @@
 #### Reminders
 - Add GH Issue ID _&_ Linear ID
 - PR title should use [conventional commit](https://develop.sentry.dev/engineering-practices/commit-messages/#type) style (`feat:`, `fix:`, `ref:`, `meta:`)
-- For external contributors: [CONTRIBUTING.md](../CONTRIBUTING.md), [Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord community](https://discord.gg/Ww9hbqr)
+- For external contributors: [CONTRIBUTING.md](https://github.com/getsentry/sentry-elixir/blob/master/CONTRIBUTING.md), [Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord community](https://discord.gg/Ww9hbqr)