Update curl_easy.h
Update curl_easy.h

These are some of the current errors I'm running into as I'm building curlcpp for Windows. I'm assuming these are misspellings of the CURLINFO types provided here: https://curl.haxx.se/libcurl/c/curl_easy_getinfo.html
JosephP91/curlcpp,JosephP91/curlcpp,susnux/curlcpp,susnux/curlcpp