v0.8.5

What's Changed

• Bug/tortuosity index by @jonnymaserati in #186
• Included grid_scale_factor in survey.SurveyHeader, which is used to c… by @jonnymaserati in #187
• Update quick start example to reflect updated module. by @jonnymaserati in #189

Full Changelog: v0.8.3...v0.8.5