Flux: Version 0.6.0

Julia: Version 0.7.0

Working through flux model zoo, lang-detection/model.jl:28, and trying to update to julia7.

You can also reproduce the erorr by just `Flux.LSTM(15,15)`

or `Flux.LSTMCell(15, 15)`

from recurrent.jl:160

Here is the stacktrace:

```
MethodError: no method matching Flux.LSTMCell(::TrackedArray{…,Array{Float64,2}}, ::TrackedArray{…,Array{Float64,2}}, ::Flux.Tracker.TrackedReal{Float64}, ::TrackedArray{…,Array{Float64,1}}, ::TrackedArray{…,Array{Float64,1}})
Closest candidates are:
Flux.LSTMCell(::A, ::A, ::V, !Matched::V, !Matched::V) where {A, V} at /Users/joshuabowles/.julia/packages/Flux/kEUDV/src/layers/recurrent.jl:116
Stacktrace:
[1] #LSTMCell#79(::typeof(Flux.glorot_uniform), ::Type, ::Int64, ::Int64) at /Users/joshuabowles/.julia/packages/Flux/kEUDV/src/layers/recurrent.jl:125
[2] Flux.LSTMCell(::Int64, ::Int64) at /Users/joshuabowles/.julia/packages/Flux/kEUDV/src/layers/recurrent.jl:125
[3] #LSTM#80(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Int64, ::Vararg{Int64,N} where N) at /Users/joshuabowles/.julia/packages/Flux/kEUDV/src/layers/recurrent.jl:160
[4] LSTM(::Int64, ::Vararg{Int64,N} where N) at /Users/joshuabowles/.julia/packages/Flux/kEUDV/src/layers/recurrent.jl:160
[5] top-level scope at none:0
```

I can see the function LSTMCell was updated recently and the problem is the method here recurrent.jl:125, but other than that I don’t really know where to go from here.