Update 'README.md'

Renamed variables from karel to asset in anticipation of more shapes.

README.md

@@ -78,30 +78,30 @@ Draw a Karel at 135X and 35y, facing west with a red background:
 karel_west = draw_karel(canvas, centre_x=135, centre_y=35, orientation="west", background="red")
 ```
 ### Changing colour
-To change the colour of any created Karel, use recolour_karel(karel, colour, background).
+To change the colour of any asset, use recolour_asset(karel, colour, background).
 For example changing a red/blue Karel to a green/yellow Karel:
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = recolour_karel(my_karel, colour="green", background="yellow) 
+my_karel = recolour_asset(my_karel, colour="green", background="yellow) 
 ```
 
-### Changing position
-To change the position of a Karel on the canvas, use move_karel(karel, x, y).
+### Changing position relative to current position
+To change the position of an asset on the canvas relative to its current position, use relative_move_asset(karel, x, y).
 Where x is the amout of pixels shifted horizontally, and y is the amount of pixels shifted vertically.
 To move a Karel up 10 pixes:
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = move_karel(my_karel, y=-10)
+my_karel = relative_move_asset(my_karel, y=-10)
 ```
 
 To move a Karel down 10 and left 10 pixels:
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = move_karel(my_karel, 10, -10)
+my_karel = relative_move_asset(my_karel, 10, -10)
 ```
 
-### Rotating Karel
-To turn karel, use rotate_karel(karel, orientation).
+### Rotating
+To turn an asset, use rotate_asset(asset, orientation).
 Orientation options:
 * "right"
 * "left"
@@ -116,19 +116,19 @@ Orientation options:
 To turn a Karel to the right:
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = rotate_karel(my_karel, "right")
+my_karel = rotate_asset(my_karel, "right")
 ```
 To turn a Akrel toward the south:
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = rotate_karel(my_karel, "south")
+my_karel = rotate_asset(my_karel, "south")
 ```
 
-### Erasing a Karel
-To remove a Karel from the canvas, use erase_karel(karel):
+### Erasing an asset
+To remove a Karel from the canvas, use erase_asset(asset):
 ```
 my_karel = draw_karel(canvas, colour="red", background="blue")
-my_karel = erase_karel(my_karel)
+my_karel = erase_asset(my_karel)
 ```
 
 ### Generating a random hex colour
@@ -173,19 +173,20 @@ def main():
         sleep(5)
         
         # Change the colour of one Karel to random colours
-        karel_east = recolour_karel(karel_east, "random", "random")
+        karel_east = recolour_asset(karel_east, "random", "random")
         
         # Move one Karel
-        karel_east_mirrored = move_karel(karel_east_mirrored, 10, 10)
+        karel_east_mirrored = move_asset(karel_east_mirrored, 10, 10)
         
         # Wait five seconds
         sleep(5)
         
         # Erase four Karels
-        erase_karel(karel_east)
-        erase_karel(karel_east_mirrored)
-        erase_karel(karel_west)
-        erase_karel(karel_west_mirrored)
+        erase_asset(karel_east)
+        erase_asset(karel_east_mirrored)
+        erase_asset(karel_west)
+        erase_asset(karel_west_mirrored)
+
 
 if __name__ == '__main__':
     main()