Add Input Validation for Zendesk Subdomain

Lack of input validation of the Zendesk subdomain could expose users of the library to Server Side Request Forgery (SSRF).

Validate the provided Zendesk subdomain to be a valid subdomain in:

• getAuthUrl
• getAccessToken

References

• PR: #466
• Security Advisory: GHSA-q348-f93x-9gx4

v2.2.10

Updated library dependencies

v2.2.9

• Minor Documentation changes
• Remove secrets and tokens from commit history

v2.2.8

• Updates on some comments
• Support for stats api in Zendesk Talk

v2.2.6

Update license identifier.

v1.2.1

Merge pull request #377 from zendesk/jose/update-license-identifier-v1

update license identifier, bump to v1.2.1

v2.2.5

• Add Article Create support #372

v2.2.4

• Add CRUD support of Ticket Field Options : #368

v2.2.3

• Add resource for api/v2/zopim_integration.json endpoint