Fix get_odatetime without until_field

See merge request !7

Otherwise no events where returned by with_occurrences when there was
no until_field.

Use get_occurrences with correct timezone

See merge request !6

Resolve "Allow excluding amended events"

Closes #5

See merge request !5

Resolve "Allow ordering lessons after calculating occurences"

Closes #4

See merge request !4

Resolve "Filtering based on start/end dates is broken"

Closes #3

See merge request !3

Merge branch '2-events-that-begin-and-or-end-outside-given-start-end-time-span-but-overlap-with-it-are-filtered' into 'master'

Resolve "Events that begin and/or end outside given start/end time span but overlap with it are filtered out"

Closes #2

See merge request !2

Configure Renovate

See merge request !1