Update Amazon bot match to cover `Amazonbot` user agent

[gabrieljablonski]

As seen in the Amazon developer docs, Amazonbot is also an user agent used by Amazon crawlers.

Did my best to follow existing code, but please let me know if there are any changes that should be made.

[codecov-commenter]

:warning: Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.72%. Comparing base (b4d6dce) to head (0660712).

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #156 +/- ## ======================================= Coverage 98.72% 98.72% ======================================= Files 24 24 Lines 235 235 ======================================= Hits 232 232 Misses 3 3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.