Bump boto3 from 1.14.52 to 1.15.9

Bumps [boto3](https://github.com/boto/boto3) from 1.14.52 to 1.15.9.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.14.52...1.15.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump botocore from 1.17.52 to 1.18.9

Bumps [botocore](https://github.com/boto/botocore) from 1.17.52 to 1.18.9.
- [Release notes](https://github.com/boto/botocore/releases)
- [Changelog](https://github.com/boto/botocore/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/botocore/compare/1.17.52...1.18.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

octodns-compare: Prefix filtering and status code on on mismatch

Fixes https://github.com/github/octodns/issues/608

Bump boto3 from 1.14.14 to 1.14.52

Bumps [boto3](https://github.com/boto/boto3) from 1.14.14 to 1.14.52.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.14.14...1.14.52)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump botocore from 1.17.14 to 1.17.52

Bumps [botocore](https://github.com/boto/botocore) from 1.17.14 to 1.17.52.
- [Release notes](https://github.com/boto/botocore/releases)
- [Changelog](https://github.com/boto/botocore/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/botocore/compare/1.17.14...1.17.52)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump google-cloud-core from 1.3.0 to 1.4.1

Bumps [google-cloud-core](https://github.com/googleapis/python-cloud-core) from 1.3.0 to 1.4.1.
- [Release notes](https://github.com/googleapis/python-cloud-core/releases)
- [Changelog](https://github.com/googleapis/python-cloud-core/blob/master/CHANGELOG.md)
- [Commits](https://github.com/googleapis/python-cloud-core/compare/v1.3.0...v1.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump pycountry from 19.8.18 to 20.7.3

Bumps [pycountry](https://github.com/flyingcircusio/pycountry) from 19.8.18 to 20.7.3.
- [Release notes](https://github.com/flyingcircusio/pycountry/releases)
- [Changelog](https://github.com/flyingcircusio/pycountry/blob/master/HISTORY.txt)
- [Commits](https://github.com/flyingcircusio/pycountry/compare/19.8.18...20.7.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Implement octodns-sync --source

It can be useful to only synchronize zones that use a certain source. For
example, in a situation where some zones use a dynamic source and others don't,
you probably want to synchronize those with a dynamic source regularly, and
only synchronize the others when a change is made.

Although we only synchronize the zones that use a given source, we still want
to synchronize all sources to avoid deleting records that would live in another
source of the zone.

Update README.md

NS1 does support CNAME via octodns :)

This commit adds support for zones aliases. This allows to define one or
multiple zone as aliases of an existing zone without using workarounds
like simlinks and miltiple "zones" entries in the configuration file.

An alias zone is share all of its content with it parent zone, only the
name of the zone is different.

```
zones:
  example.com.:
    aliases:
      - example.net.
      - example.org.
    sources:
      - in
    targets:
      - out
```

Known issues:
- No documentation,
- Only the `octodns-sync` and `octodns-validate` commands supports
aliases zones at this time,

I added a loop in the manager init function which convert all alias
zone to "real" ones during config validation, however I'm not sure
this is the right approach. Comments welcome.

Adding Octodns provider class for easyDNS

* Removed conversion of DYN records to A records
* Updated test fixtures to change test DYN to an A record

* Removed conversion of URL and STEALTH records to CNAME records
* Updated test fixtures to remove URL conversion testing

Add support for wildcard SRV records, as shown in RFC 2782

Cloudflare: Increase page size

fix: dependency 'ipaddress' unnecessary for py >= 3.2

Also corrects futures to 3.2 in requires

* Replaced camelCase with snake_case
* Change apikey to api_key
* Added check on record name before delete during domain_create

Adding environment variable record injection

Per the discussion on https://github.com/github/octodns/issues/583
here is a work in progress of environment variable injection for
discussion.