Do not ever modify files in the vendor/ folder. Ever. They can and will be overwritten on the next composer update you run.
Here is my Solution for WampServer
I am using PHP 7.1.9 for my WampServer, so change 7.1.9 in the example below to the version number you are currently using.
Download this file: http:
Place this file in the C:\wamp64\bin\php\php7.1.9 folder
Open php.iniand find this line:
;curl.cainfo
Change it to:
curl.cainfo = "C:\wamp64\bin\php\php7.1.9\cacert.pem"
Make sure you remove the semicolon at the beginning of the line.
Save changes to php.ini, restart WampServer, and you're good to go!