throwing exceptions at line_logger destructor

[sryio]

Hi, when I using spdlog on android with android sink, I found spdlog may throwing exceptions in line_logger's destructor, and cannot be catched by my outer functions, which cause crashes.

spdlog::details::line_logger::~line_logger()
-> _callback_logger->_log_msg(_log_msg)
-> sink->log(msg)
-> base_android_sink::_sink_it()
->throwing spdlog_ex
-> crash

[gabime]

related to #136

[gabime]

Fixed. line_logger removed after (removing streaming API)