Update rust version in bug_repport file

Author: bidoubiwa

.github/ISSUE_TEMPLATE/bug_report.md

@@ -22,5 +22,5 @@ If applicable, add screenshots or logs to help explain your problem.
 
 **Environment (please complete the following information):**
 - OS: [e.g. Debian GNU/Linux]
-- Meilisearch version: [e.g. v.0.29.1]
-- meilisearch-rust version: [e.g v0.8.1]
+- Meilisearch version: [e.g. v.0.20.0]
+- meilisearch-rust version: [e.g v0.20.1]