Fixed typo in word color inside README (anuraghazra#2652)

Author: necofuryai

readme.md

@@ -183,7 +183,7 @@ We have included a `transparent` theme that has a transparent background. This t
 
 ##### Add transparent alpha channel to a themes bg_color
 
-You can use the `bg_color` parameter to make any of [the available themes](./themes/README.md) transparent. This is done by setting the `bg_color` to a colour with a transparent alpha channel (i.e. `bg_color=00000000`):
+You can use the `bg_color` parameter to make any of [the available themes](./themes/README.md) transparent. This is done by setting the `bg_color` to a color with a transparent alpha channel (i.e. `bg_color=00000000`):
 
 ```md
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