Inada Naoki

We have dropped old go versions. So we can improve how ErrBadConn handled. Since database/sql uses IsValid() and ResetSession() to check connection, we can return i/o errors without translating them...

Support msgpack Timestamp type in in_forward.

1

**Is your feature request related to a problem? Please describe.** Currently, in_forward supports only custom [EventTime](https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1#eventtime-ext-format) type for precious timestamp. But msgpack added [Timestamp](https://github.com/msgpack/msgpack/blob/master/spec.md#timestamp-extension-type) ext-type after forward protocol added EventTime....

Index pages use `–` but it can not be used in ePub

3

### Describe the bug Books.app shows "error on line 34 at column 29: Entity 'ndash' not defined" on index pages. epubcheck shows > FATAL(RSC-016): build/epub/Python.epub/genindex-A.xhtml(34,29): Fatal Error while parsing file:...