update prompt (#158)

<!-- This is an auto-generated comment: release notes by openai -->
### Summary by OpenAI

Release Notes:

- New Feature: Added a new format for review comments in the response of
the API, including start and end line numbers.

> "Code reviews made easy,
> With start and end lines so breezy.
> Bugs beware, we'll find you soon,
> Thanks to this PR's boon."
<!-- end of auto-generated comment: release notes by openai -->

src/review.ts

@@ -405,6 +405,9 @@ Response format expected -
   \`\`\`suggestion
   <code/text that replaces everything between start_line_number and end_line_number>
   \`\`\`
+  ---
+  <start_line_number>-<end_line_number>:
+  <review comment>
   <new code, if applicable>
   \`\`\`<language>
   <new code snippet>
@@ -420,9 +423,6 @@ Example response -
   \`\`\`suggestion
   print("Hello!")
   \`\`\`
-  \`\`\`go
-  log.Info().Msgf("Example")
-  \`\`\`
   ---