v0.1.6: Release 0.1.6

 * Support lua-term in writer.console.color
 * Add prefix writer
 * Add protect format writer
 * Add set methods to writer/formatter/logformat
 * Add default formatter
 * Allow pass writer maker as function

v0.1.5: Fix. Worker thread can correctly close all writers.

Fix. Support lzmq > 0.4.0

v0.1.4: Release 0.1.4

* File writer could reuse existing file.
* Adds support `llthreads2` library.
* Bug fixes.