refs https://github.com/TryGhost/Toolbox/issues/348

- With the release of Ghost v5 the default content version should be sent as "v5.0"

refs https://github.com/TryGhost/Toolbox/issues/348
refs 2033456

- Tests should've been updated for admin-api-sdk package too!

 - @tryghost/admin-api@1.12.2
 - @tryghost/content-api@1.10.1
 - @tryghost/helpers-gatsby@2.0.0

refs https://github.com/TryGhost/Toolbox/issues/348
refs 9d44031

- The "host" parameter has been deprecated for few years now. It is not used in any of the clients we maintain and anybody who uses it externally had enough time to migrate.

refs https://github.com/TryGhost/Toolbox/issues/348
refs 9d44031

- The "host" parameter has been deprecated for few years now. It is not used in any of the clients we maintain and anybody who uses it externally had enough time to migrate.

refs https://github.com/TryGhost/Toolbox/issues/348
refs https://github.com/TryGhost/Toolbox/issues/301
refs #426

- In certain environments (e.g. web browser) the client might want to disable sending User-Agent variable to avoid errors like in #426.
- This is also a groundwork to have smarter defaults based on the environment - userAgent header would be disabled by default in browser environments as that's the main use case and will be enabled for nodejs environment

refs https://github.com/TryGhost/Toolbox/issues/348
refs https://github.com/TryGhost/Toolbox/issues/301
closes  #426
refs https://bugs.chromium.org/p/chromium/issues/detail?id=571722

- When Content API SDK is used in Chrome browser the requests are throwing "Refused to set unsafe header "User-Agent" errors. This is a bug in chrome due to historical reasons - the "User-Agent" header used to be on a "forbidden header names" list and still is in chrome.
- In case the client needs to send the User-Agent header in Firefox for example the SDK can be configured with `userAgent: true` parameter

refs https://github.com/TryGhost/Toolbox/issues/348
refs https://github.com/TryGhost/Toolbox/issues/301

- Allows for a full control over the 'User-Agent' header. Enables customizing the header in whatever way the client needs (for example prepending a value when there's a wrapping library using the SDK)

refs https://github.com/TryGhost/Toolbox/issues/348
refs https://github.com/TryGhost/Toolbox/issues/301

- The behavior is symmetric to the one in Conte API SDK allowing to optionaly disable sending User-Agent header. Gives more control to the client to skip sending the header for whatever reason

refs https://github.com/TryGhost/Toolbox/issues/348
refs https://github.com/TryGhost/Toolbox/issues/301

- Allows for a full control over the 'User-Agent' header. Enables customizing the header in whatever way the client needs (for example prepending a value when there's a wrapping library using the SDK)

reverts 7fe05c1.
refs https://github.com/TryGhost/Toolbox/issues/348

- This is a breaking change and should go into a major release instead
of a patch release, that is planned to be done next

reverts 931c845.
refs https://github.com/TryGhost/Toolbox/issues/348

- Dropping the parameter would be breaking changes and would need a
major release. That would be done after recent bugfixes come in and
are released as a part of a minor bump

 - @tryghost/admin-api@1.13.0
 - @tryghost/color-utils@0.1.19
 - @tryghost/content-api@1.11.0
 - @tryghost/helpers-gatsby@2.0.1
 - @tryghost/helpers@1.1.71
 - @tryghost/timezone-data@0.2.70