Update dependency ember-ajax to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ember-ajax	devDependencies	major	3.1.0 -> 5.0.0

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Release Notes

ember-cli/ember-ajax

v5.0.0

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Breaking Changes

• Update ember-cli-babel to v7.x
  (this requires apps to use Ember CLI 2.13 or above)

• Extend the native Error class instead of EmberError
  (fixes compatibility with Ember 3.8)

• Drop Node 4 from engines declaration in package.json
  (CI had already been running on Node 6 for a while already)

Bug Fixes

• Restore ability to override the ajax service using a JS file

Documentation

• Add "Compatibility" section to the README file

v4.0.2

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Bug Fixes

• deprecation: the new EmberObject is deprecated (80e6e15)

v4.0.1

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4.0.1 (2018-12-10)

v4.0.0

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Bug Fixes

• bump typescript to get working d.ts (975724d), closes #​388
• is*Error type definitions (101c357)
• skip instead of returning url when namespace is present in url (fe518dc)

Changes for each version can be found as part of the release notes on Github.

v3.1.3

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v3.1.2

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Bug Fixes

• bump typescript to get working d.ts (975724d), closes #​388
• is*Error type definitions (101c357)
• skip instead of returning url when namespace is present in url (fe518dc)

Changes for each version can be found as part of the release notes on Github.

v3.1.1

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