v0.9.0

• Fix a bug which caused the charsets text decoder to panic #32 @adamreichold
• Add Accept: */* and User-Agent headers if not provided by user @sbstp
• Improve chunked encoding reader to avoid a layer of buffering @adamreichold
• Add limits on the length of lines read in the chunked encoding reader and the header parser @adamreichold
• Remove implementation of Error::description @adamreichold
• Improve the Happy Eyeballs code to make it cleaner and better @adamreichold