Mention the first release of CURLOPT_FTP_FILEMETHOD

docs/libcurl/curl_easy_setopt.3

@@ -1190,6 +1190,7 @@ libcurl does one CWD with the full target directory and then operates on the
 file \&"normally" (like in the multicwd case). This is somewhat more standards
 compliant than 'nocwd' but without the full penalty of 'multicwd'.
 .RE
+(Added in 7.15.1)
 .SH PROTOCOL OPTIONS
 .IP CURLOPT_TRANSFERTEXT
 A parameter set to 1 tells the library to use ASCII mode for FTP transfers,