v2.0.3: Fix "invalid use of incomplete type ‘std::stringstream'" (#36)
* Fix "invalid use of incomplete type ‘std::stringstream'" Include <sstream> to fix this issue for gcc7/8 on linux Same fix as 37ac531413b0b571aca052fce2eb237a056dc4bb but for new files, I guess * FIx Moved includes to jwtpp.hh Co-authored-by: Anton Schmidt <shas@tsfer.ru>