Fix[bug] -> Session cookies without Double quotes

[pyleo-1998]

The session cookie values exhibit an additional presence of double quotes within the value, as clearly demonstrated in the attached screenshot depicting the tracked Scala request in Burp Suite.

As a consequence, the requested server is unable to retrieve the information associated with the cookies sent in the requested payload.
The updated pull request has modified the source code of the Scala request to include the cookie values without double quotes. The tracked HTTP request in the Burp Suite, depicted in the screenshot below, was sent by the modified Scala request library.

[mslxl]

I met the same problem, the double quote will prevent some server from parse its value(like pixiv.net uses). So I tried to find some information.

The quote was added on #73, based on RFC2109. But RFC2109 defined syntax of cookie as following:

cookie          =       "Cookie:" cookie-version
                        1*((";" | ",") cookie-value)
cookie-value    =       NAME "=" VALUE [";" path] [";" domain]
cookie-version  =       "$Version" "=" value
NAME            =       attr
VALUE           =       value
path            =       "$Path" "=" value
domain          =       "$Domain" "=" value

attr            =       token
value           =       word
word            =       token | quoted-string

where the token is a sequence of non-special, non-white space characters.

Obviously, #73 missing cookie-version to specific version, which may caused server did not work. And even add cookie-version, some server still not support it yet.

Maybe is better to add a option cookieVersion to choose corresponding version, or just use cookie version 0 simply(by removing double quote and add URLEncode to escape whitespace etc.), or do noting when send data, let user preprocess the header by hand