Fix misspelled word in issue template (#254)

Author: per1234

Diff for: .github/ISSUE_TEMPLATE/bug_report.md

@@ -14,9 +14,9 @@ about: If something isn't working as expected 🤔.
 
 ### Environment
 
-- CLI version (output of `ardunio-cli version`):
+- CLI version (output of `arduino-cli version`):
 - Go version (if building from sources):
 - OS version:
 
 ### Additional context
-<!-- (Optional) Add any other context about the problem here. -->
+<!-- (Optional) Add any other context about the problem here. -->