Update README.md (#140)

Author: kimikage

README.md

@@ -29,13 +29,13 @@ represents the "RGB vector space" version.
 
 ## Usage
 
-```jl
+```julia
 using ColorTypes, ColorVectorSpace
 ```
 
 That's it. Just by loading `ColorVectorSpace`, most basic mathematical
 operations will "just work" on `AbstractRGB`, `AbstractGray`
-(`OpaqueColor{T,1}`), `TransparentRGB`, and `TransparentGray` objects.
+(`Color{T,1}`), `TransparentRGB`, and `TransparentGray` objects.
 (See definitions for the latter inside of `ColorTypes`).
 
 If you discover missing operations, please open an issue, or better