Add alias to WhiteKernel, EyeKernel

Author: sharanry

src/kernels/constant.jl

@@ -23,6 +23,8 @@ Kernel function working as an equivalent to add white noise.
 """
 struct WhiteKernel <: BaseKernel end
 
+const EyeKernel = WhiteKernel
+
 kappa(κ::WhiteKernel,δₓₓ::Real) = δₓₓ
 
 metric(::WhiteKernel) = Delta()