v0.2.5

This release features the following changes:

• Fix rfc search on machines with low Bash ARG_MAX (bug found and fixed by @delucks)
• Fix rfc sync week and rfc sync month that were broken when ftp.rfc-editor.org started redirecting to www.rfc-editor.org a while ago
• rfc sync now fails if given an unknown mode, like rfc sync foobar.
• If passed as the first argument, --debug enables Bash commands tracing.