bump version to 3.1 (stablekernel#603)

3.0.2

3.0.1

3.0.0

Performance improvements (stablekernel#335)

* Performance improvements

* Changelog

Storing image offsite

Fix README url

udpate changelog and readme

Update README.md

Remove slowdown from capturing stack traces (stablekernel#273)

* Remove slowdown from capturing stack traces

* Default to false