Implement Inspect protocol for Chex.Game

[aglassman]

Inspect protocol implemented for Chex.Game struct.

Description

Returns unicode representation of chess board.

Related Issue

#60

Motivation and Context

Provides a human readable representation of the game state.

How Has This Been Tested?

Tested using default state, and state generated from FEN string.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[aglassman]

I may need to update the readme to use Chex.new_game!() and show the new inspect output.

[alecho]

I can't believe I just saw this! Thanks for the PR!

[aglassman]

No worries! I totally forgot I did this.