Fix CURLOPT_SSL_VERIFYHOST issue

libcurl's CURLOPT_SSL_VERIFYHOST option accepts only values 0 and 2. This fix is fail-secure in that SSL host verification will be enabled regardless of what a caller passes to Request::verifyHost($bool) unless $bool === false.

src/Unirest/Request.php

@@ -416,7 +416,8 @@ class Request
             CURLOPT_HTTPHEADER => self::getFormattedHeaders($headers),
             CURLOPT_HEADER => true,
             CURLOPT_SSL_VERIFYPEER => self::$verifyPeer,
-            CURLOPT_SSL_VERIFYHOST => self::$verifyHost,
+            //CURLOPT_SSL_VERIFYHOST accepts only 0 (false) or 2 (true). Future versions of libcurl will treat values 1 and 2 as equals
+            CURLOPT_SSL_VERIFYHOST => self::$verifyHost === false ? 0 : 2,
             // If an empty string, '', is set, a header containing all supported encoding types is sent
             CURLOPT_ENCODING => ''
         ));