v0.6.0

Release version 0.6.0

Added
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- Uniform circle sampling.
- Path cost before optimization.
- Different `steer` procedures.
- _Entry_ input.
- Steered1/2 vectors to remember steered nodes.
- Tmp steered in `connect` method.
- Overloaded next and connect in `rrtext12`.

Changed
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- Log path each 0.1 seconds, stop algorithm after 2 seconds.
- Include last maneuver to the path optimization.
- Goal zone to consider the range of the heading.
- Steer until collide.
- Steer by 0.2 m.

Fixed
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- Sampling in circle.