pino

This release gets the 2.x branch up to date with the latest bug-fixes and new features from master and as such include all non-breaking commits that have been released from v3.0.0 up until v3.1.0, including:

• Improve the error serializer #146 #157

• Fix prettifier error when receiving null value input #154 #155 @jsumners

• Split README into multiple files for better organization #152 #153 @jsumners

• Reduce the size of the package #137 #136 @osher

• Readme tweak fix @davidmarkclements

• Condense README #143

• Fix for #139, #141

• Added pino-debug to readme - #133 - @davidmarkclements

• Improved deep object interpolation performance and fixed double escaping bug #129

• Open Open Source #127 #118

• Refactor the internal constructors #125