[4.0.x] api fix for spent height and bump to 4.0.2 (mimblewimble#3402)

* include height even for spent outputs in get_outputs api (mimblewimble#3400)

* bump to 4.0.2

bump to 4.0.1 (mimblewimble#3391)

Versioning for 4.0.0 release (mimblewimble#3373)

Version bump for 4.0.0-rc.1 (mimblewimble#3366)

bump version to 4.0.0-beta.2 (mimblewimble#3351)

4.0.0-beta.1 Version Bump (mimblewimble#3339)

Version 3.1.1