Fix problem with IPv6 address

cpp-httplib now accepts IPv6 address such as http://[::1]:1234.

Content Provider Resource Releaser interface change

It's a breaking change from v0.8.x. The content provider resource releaser now takes bool success parameter to see if the all the content have been sent to the client successfully.

Fix SSL read timeout errors on Windows

Fix virtual call in ClientImpl::~ClientImpl() (#942)

* Fix virtual call in ClientImpl::~ClientImpl()

This fixes a warning in clang tidy:

> Call to virtual method 'ClientImpl::shutdown_ssl' during
> destruction bypasses virtual dispatch

ClientImpl::~ClientImpl() calls lock_socket_and_shutdown_and_close()
that itself calls shutdown_ssl().  However, shutdown_ssl() is virtual
and C++ does not perform virtual dispatch in destructors, which results
in the wrong overload being called.

This change adds a non-virtual shutdown_ssl_impl() function that is
called from ~SSLClient().  We also inline sock_socket_and_shutdown_and_close()
and removes the virtual call in ~ClientImpl().

* Inline and remove lock_socket_and_shutdown_and_close()

The function only has one caller.

Fix timeout problems and Remove redundant call to close_socket

v0.8.8

Remove redunant call to close_socket (#911)

Added `set_address_family`

v0.8.7

Code format

Fix content reader problem with auto redirection

v0.8.6

Additional changes for #889

Fix problem with Get with Parameters

v0.8.5

Fix #878

Fix response line parsing problem without reason phrase

v0.8.4

Fix #860

Add exception handler support

Add exception handler (#845)

* Add exception handler

* revert content reader changes

* Add test for and fix exception handler

* Fix warning in test

* Readd exception test, improve readme note, don't rethrow errors, remove exception handler response

Minor API breaking change for the pre request handler

It now takes HandleResponse as a return value.