Bump django-ical from 1.5 to 1.8.0

[dependabot-preview[bot]]

Bumps django-ical from 1.5 to 1.8.0.

Changelog

Sourced from django-ical's changelog.

1.8.0 (2021-05-21)

• Add VALARM support and documentation. [malteger]

1.7.3 (2021-05-03)

• Fix calendar Content-Type headers. Previous configuration included multiple comma separated values in the header, which is incompatible with the HTTP header specification. [aleksihakli]

1.7.2 (2020-12-16)

• Add support for Python 3.9. [aleksihakli]
• Add support for Django 3.1. [aleksihakli]
• Add tox QA with black and prospector. [aleksihakli]
• Migrate from Travis to GitHub Actions. [aleksihakli]

1.7.1 (2020-05-09)

• Drop support for Django 1.11 LTS. [aleksihakli]
• Fix string comparison in tests. [aleksihakli]

1.7.0 (2019-10-09)

• Add calendar MIME types for feeds. [xkill]
• Add attendees for calendar events. [webaholik]

1.6.2 (2019-08-30)

• Language and documentation improvements.

1.6.1 (2019-08-30)

• Python 3.8 and PyPy support.

1.6 (2019-08-27)

• Drop support for old Python and Django versions. This enables support for new Django versions which do not have Python 2 compatibility shims.
• Add continuous delivery via Jazzband.
• Add SCM versioning via setuptools_scm.

Commits

• f9a07ab Version 1.8.0
• e608298 Add example for VALARMS in docs
• fd719d4 Add support for VALARM option.
• 726aa46 Fix broken link for item_attendee in docs
• 10a9e25 Version 1.7.3
• e84fe5a Fix Content-Type headers
• 3e18338 Remove duplicate ignore_errors
• 40fd93a Don't run Django main test on Python < 3.8.
• 6eb64b2 Rename Django's dev branch to main.
• 595e4c3 Migrate from Travis to GitHub actions (#43)
• Additional commits viewable in compare view

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[stevejalim]

Done already