Fixed bugs:

• (srfi :143) exported incorrect name
• Issue #228: srfi 134 errors

New features:

• &dbi-sql-error condition has been added to (dbi)
• string->smtp-address and smtp-valid-address? have been added to (rfc smtp)
• Client cookie parsing procedures parse-cookies and parse-cookies-string have been added to (rfc cookie)
• Pseudo random number generator ChaCha20 has been supported.