v2.0.6

Roots v2.0.6

Diff since v2.0.5

Merged pull requests:

• Create Invalidations.yml (#319) (@ranocha)
• add inverse function example after discourse example (#327) (@jverzani)
• add comments on autodiff and bisection algorithm (#328) (@jverzani)
• Issue 314 (#329) (@jverzani)
• version bump (#330) (@jverzani)