Just update your php.ini file and remove Deprecated warnings from being displayed. This won't cause your site to malfunction and can be ignored.
Open your php.ini file for your wamp server... it will be located at:
C:\wamp64\bin\apache\apache2.4.17\bin\php.ini
and find the line that begins with:
error_reporting =
(mine was line 449) and update it to:
error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT