Bump django from 3.0.1 to 3.0.3

Bumps [django](https://github.com/django/django) from 3.0.1 to 3.0.3.
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/3.0.1...3.0.3)

Signed-off-by: dependabot[bot] <[email protected]>

Need customer data to stay in braintree until the end of each month for tax reports.

Updated default port in readme

Updated default port in readme

The default port after following the directions is actually 8000 instead of 8080.

Add a Pause button in the checks list. Fixes #312

Increase allowable length of Matrix room alias

The existing 40 character limit prevents using the integration will
Matrix servers that might have a fairly lengthy hostname (ie.
'matrix.internal.example.com' would only allow 12 characters for the
room name or ID, and room IDs are 19 characters long).

Increasing the `max_length` to `100` is still fairly arbitrary but it
does match up with the `max_length` of the `name` field of the `Channel`
model and should cover most instances.