exit when setopts result is {error,closed} mochi#152

update CHANGES for v2.12.1

send "Connection: close" header when the server is going to force-clo…

…se the connection mochi#146

Fix range parsing regression introduced in mochi#147

update CHANGES for 2.11.1

Merge pull request mochi#145 from mochi/ssl-transport-accept

mitigate SSL and emfile related conditions per mochi#138

update CHANGES for 2.10.1

update CHANGES for v2.10.0 mochi#134

update CHANGES and README for v2.9.2 mochi#140

update version to 2.9.1