Update ANOVA.jl, fixing line 7

[DanielEWeeks]

I think this simple change may suffice to fix the precompilation issue I reported in this GitHub Issue:

#1

Change line 7 of ANOVA.jl from

(alpha, beta) = (sum(S, dims = 2), beta = sum(S, dims = 1))

to

(alpha, beta) = (alpha = sum(S, dims = 2), beta = sum(S, dims = 1))

julia> function two_way_ANOVA(Y::Array{T, 3}) where T <: Real
         (i, j, k) = size(Y)
         S = sum(Y, dims = 3)
         (alpha, beta) = (sum(S, dims = 2), beta = sum(S, dims = 1))
         mu = sum(alpha) / (i * j * k)
         alpha = alpha / (j * k) .- mu
         beta = beta / (i * k) .- mu
         return (mu, alpha, beta)
       end
ERROR: syntax: invalid named tuple element "sum(S, dims = 2)" around REPL[31]:4
Stacktrace:
 [1] top-level scope
   @ REPL[31]:1

julia> function two_way_ANOVA(Y::Array{T, 3}) where T <: Real
         (i, j, k) = size(Y)
         S = sum(Y, dims = 3)
         (alpha, beta) = (alpha=sum(S, dims = 2), beta = sum(S, dims = 1))
         mu = sum(alpha) / (i * j * k)
         alpha = alpha / (j * k) .- mu
         beta = beta / (i * k) .- mu
         return (mu, alpha, beta)
       end
two_way_ANOVA (generic function with 1 method)