Merge pull request #258 from sendinblue/WF-2702

WF-2702 : sdk updated to latest features

Merge pull request #249 from sendinblue/WF-2401-verion-update

WF-2401 : version updated

Merge pull request #242 from sendinblue/feature_WF-2088

WF-2088 :  php sdk update

Merge pull request #229 from sendinblue/AST-11

AST-11 : GetEmailCampaign route not returning statistics filed data

Merge pull request #219 from sendinblue/feature_AST-4

AST-4 : PHP wrapper update AST-4

Merge pull request #209 from sendinblue/feature_AP-2076

AP-2076 : making PSR-4 compliant

Merge pull request #204 from sendinblue/feature_AP-2076

AP-2076 : PHP wrapper update

Merge pull request #198 from sendinblue/feature_AP-2031

AP-2031 PHP wrapper update

Merge pull request #188 from sendinblue/feature_AP-1639

AP-1639 Update major version

Merge pull request #178 from sendinblue/feature_guzzle-update

Support guzzlehttp version update