mailchimp 7.x-4.9

If upgrading to 7.x-4.9, please be sure to also upgrade to the latest version of the MailChimp library to ensure things go smoothly.

Changes since 7.x-4.8:

• #2829777 by benstjohn, idebr: Translate Radio and Select fields from mc
• #2873490 by adr_p: Updating email address w/o unsubscribe
• #2831786 by hansrossel: Cache creates redirects
• #2833538 by amyvs: Enabling mailchimp_i18n produces fatal error
• #2706593 by Arrow, stewart.adam, MegaChriz: Opt-in confirmation mail is sent every time user_save() is called for users with pending status
• #2852475 by MegaChriz: Already subscribed member gets status "pending" when he/she subscribes using double opt-in, but gets no confirmation mail
• #2856527 by Thomas Bosviel: Batch update PHP warnings
• #2899220 by Arrow: Subscribe field on user profile has cache issue when double-opt-in is enabled
• #2899628 by scuba_fly: Readme needs an update lib version 1.0.7 instead of 1.0.6
• #2820753 by jsst, denix, aitala, stephen-cox: Allow using HTTP proxy using the new v3 API client library
• #2754819 by mchampsee, Perignon, helmo: Allow use of HTML5 placeholder attribute
• #2877477 by ruscoe: Batch list mergevar update fails for lists with a large number of subscribers
• #2188819 by jdhildeb, dmsmidt, Greg Boggs, praveen@ewall, JordanMagnuson: Cannot resubscribe an email email address which has been unsubscribed
• #2850301 by pachabhaiya: One of the library files loaded in hook_libraries_info() is missing file extension
• #2833376 by davidraijmakers: Multiple mailchimp_results in mailchimp_signup_subscribe_form_submit
• #2825672 by MegaChriz, karel010: mailchimp_unsubscribe_process() always deletes members instead of unsubscribing
• #2851901 by bangpound, krina.addweb, MegaChriz, FrittenKeeZ: Remove version from composer.json