TODO/FIXME list

[zhaozg]

• https://github.com/zhaozg/lua-openssl/search?q=memleaks&type=code

• https://github.com/zhaozg/lua-openssl/blob/master/test/5.x509_req.lua#L173 related with https://www.openssl.org/docs/man1.1.1/man3/i2d_re_X509_REQ_tbs.html

• https://github.com/zhaozg/lua-openssl/search?q=TODO&type=code

• https://github.com/zhaozg/lua-openssl/search?q=FIXME&type=code