Snake's vertical speed is greater than the horizontal speed

[saayv1]

Steps to reproduce the issue :

1. run $GOPATH/bin/snake-game in the terminal

2. press up/down arrow keys and the left/right arrow keys and notice the speed.

[TheSchemm]

This seems to be solely because of rectangular aspect ratio of each grid space, which is really just a colored space. The speed of the snake is in characters per second, and seeing as the height of a character block is greater than the width of a block, the snakes movement is greater in the Y direction when measured by pixels on the screen.