Versioning for 4.0.0 (mimblewimble#459)

Version bump to v4.0.0-rc.1 (mimblewimble#458)

Version bump for 4.0.0-beta.3 (mimblewimble#448)

Version Bump for v4.0.0-beta.2 (mimblewimble#437)

Version Bump for v4.0.0-beta.1 (mimblewimble#427)

[3.1.x] Fix Tor send (mimblewimble#424)

* Replace hyper-socks2 with yeastplume fork

* Bump Grin dependency to 3.1.1

* Bump to 3.1.2

Update hyper-timeout (mimblewimble#357)

Version bump for 3.1.0 release (mimblewimble#350)

Version increment for 3.1.0-beta.2 (mimblewimble#346)

Shutdown runtime after task is completed (mimblewimble#331)

* Use current thread for tokio runtime

* Use single thread runtime with shutdown