Remove redundant word 'the' from USAGE.md.
Remove redundant word 'the' from USAGE.md.

Change the sentence 'The the parent may then associate the whitelabel via the subuser management tools.' to 'The parent may then associate the whitelabel via the subuser management tools.'.
julianjmaurer/sendgrid-java,julianjmaurer/sendgrid-java,pushkyn/sendgrid-java,sendgrid/sendgrid-java,pushkyn/sendgrid-java