SOC-357: Modify header content type
SOC-357: Modify header content type

customcommander/mendeley-javascript-sdk,Mendeley/mendeley-javascript-sdk,charliehw/mendeley-javascript-sdk,massa84/mendeley-javascript-sdk,Alex-Radu/mendeley-javascript-sdk,charliehw/mendeley-javascript-sdk,customcommander/mendeley-javascript-sdk,paulwib/mendeley-javascript-sdk