I need to increase a matrix inside a function. But `append!`

works for vectors but doesn’t work for matrices

```
arg1=[1 2;3 4];
julia> append!(arg1, [5,6])
ERROR: MethodError: no method matching append!(::Array{Int64,2}, ::Array{Int64,1})
Closest candidates are:
append!(::Array{#s58,1} where #s58, ::AbstractArray{T,1} where T) at array.jl:895
append!(::Array{T,1} where T, ::Any) at array.jl:902
```

So I thought in this trick via `reshape`

but no luck either

```
julia> arg2=reshape(append!((reshape(arg1,:)), [5,6]), (2,3))
2×3 Array{Int64,2}:
1 2 5
3 4 6
julia> arg1
2×2 Array{Int64,2}:
1 2
3 4
```

So, even all those operations are *inplace* the input `arg1`

was not modified. This happens apparently because `reshape`

creates a new object that in spite sharing the same memory is different thing and is that new object that gets appended.