Release version 1.6.0

Add module of utility methods:

• Generate grid-pattern images.
• Find corresponding points between the distorted and undistorted space.
• Unwarp a color image with an option to keep the original field of view.
• Unwarping an image or video using the 'remap' function in Opencv for fast
  performance.

Release version 1.5

• Improve methods for perspective distortion correction.
• Add missing options to enable/disable optimization.
• Improve coverage.

Version 1.4

• Add methods for correcting perspective distortion.
• Add pre-processing methods for a line-pattern image and a chessboard image.
• Add documentation.

v1.3

Installable using Pip and Conda