Update bug report template to include version info

Author: jonas-schievink

.github/ISSUE_TEMPLATE/blank-issue.md renamed to .github/ISSUE_TEMPLATE/blank_issue.md

@@ -14,7 +14,10 @@ Forum for questions: https://users.rust-lang.org/c/ide/14
 Before submitting, please make sure that you're not running into one of these known issues:
 
  1. on-the-fly diagnostics are mostly unimplemented (`cargo check` diagnostics will be shown when saving a file): #3107
- 2. attribute proc macros are supported but not enabled by default: #6029
 
 Otherwise please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3.
 -->
+
+**rust-analyzer version**: (eg. output of "Rust Analyzer: Show RA Version" command)
+
+**rustc version**: (eg. output of `rustc -V`)