Generate requirements.txt from Pipenv

[glensc]

This should solve dependabot problem of updating only Pipfile.

As I understand, if requirements.txt is generated this way, then dependabot is able to update it as well.

See:

• Question about Python requirements.txt dependabot/feedback#435 (comment)

Also:

• Bump plexapi from 4.6.1 to 4.7.0 #400 (comment) cc @chrillep
• Bump requests-cache from 0.7.1 to 0.7.2 #397 (comment) cc @twolaw
• Question about Python requirements.txt dependabot/feedback#435
• requirements.txt is ignored when Pipfile exists dependabot/dependabot-core#1946

[chrillep]

yes after reading the comments again. I misunderstood what generating through pipen would do for dependabot. so good catch 😊

[glensc]

Yep. it works now, updates both files:

• 9fc1375 (#533)

but, it's stupid, it updates some other dependencies as well not just one mentioned in a PR itself.

but it's no new behavior, it did that already before when updated only Pipfile:

• 17d8539 (#533)