v0.8.1 — alpha

Changes in this version:

• Fixed a bug where connection::uflow() (incrementing) was used instead of connection::underflow() (non-incrementing), causing request to not act as a well-formed std::streambuf
• Replaced the last few comparisons with traits_type::eof() to use traits_type::not_eof(), which is more correct
• Reworded a bit of the tutorial to be more friendly
• Decreased required CMake version to 3.6, as that's the latest available in EPEL for CentOS
• Made return type of request::connection() namespace-explicit as it made GCC choke
• Revised examples to make them simpler and fix typos
• Added accessors to connection for the server address & port in addition to the ones for the client
• Fixed the "hello world" example sometimes hanging on flushing the incoming request