Increase area label predictions to 25% of issues

[jlewi]

Filing this issue to track improving the area label predictions to 25%

Here's the current report:
https://storage.cloud.google.com/issue-label-bot-dev_reports/metrics_2020_0406.html

We are currently generating area labels for approximately 1.4% of issues.

[issue-label-bot]

Issue-Label Bot is automatically applying the labels:

Label	Probability
kind/feature	0.84

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Links: app homepage, dashboard and code for this bot.

[jlewi]

It would be worth it to try to train a model using AutoML and see what the quality is.
https://cloud.google.com/natural-language/automl/docs/prepare