Undefined error when trying to write to a non-writeable zgroup

The functions `zgroup` and `zcreate` to create a subgroup and subarray in a group attempt to throw an IOError if the group is not writeable, but `IOError` is not defined. (c.f. `Base.IOError` in the function `consolidate_metadata` which is defined). 

https://github.com/JuliaIO/Zarr.jl/blob/0a6cf35812e10475869795a385e4c744309ec899/src/ZGroup.jl#L149-L169

Example:
```julia
using Zarr
g = zgroup("test.zarr")
g = zopen("test.zarr")
zcreate(Float32, g, "foo", 5)
```
produces
```julia
ERROR: UndefVarError: `IOError` not defined in `Zarr`
Suggestion: check for spelling errors or missing imports.
Stacktrace:
 [1] zcreate(::Type{Float32}, g::ZGroup{DirectoryStore}, name::String, addargs::Int64; kwargs::@Kwargs{})
   @ Zarr ~/.julia/packages/Zarr/3QSdj/src/ZGroup.jl:151
 [2] zcreate(::Type{Float32}, g::ZGroup{DirectoryStore}, name::String, addargs::Int64)
   @ Zarr ~/.julia/packages/Zarr/3QSdj/src/ZGroup.jl:150
 [3] top-level scope
   @ REPL[13]:1
```

	"Create a subgroup of the group g"
	function zgroup(g::ZGroup, name; attrs=Dict())
	g.writeable \|\| throw(IOError("Zarr group is not writeable. Please re-open in write mode to create an array"))
	g.groups[name] = zgroup(g.storage,_concatpath(g.path,name),attrs=attrs)
	end

	"Create a new subarray of the group g"
	function zcreate(::Type{T},g::ZGroup, name::AbstractString, addargs...; kwargs...) where T
	g.writeable \|\| throw(IOError("Zarr group is not writeable. Please re-open in write mode to create an array"))
	name = string(name)
	z = zcreate(T, g.storage, addargs...; path = _concatpath(g.path,name), kwargs...)
	g.arrays[name] = z
	return z
	end

	HTTP.serve(s::Union{ZArray,ZGroup}, args...; kwargs...) = HTTP.serve(s.storage, s.path, args...; kwargs...)
	writezip(io::IO, s::Union{ZArray,ZGroup}; kwargs...) = writezip(io, s.storage, s.path; kwargs...)
	function consolidate_metadata(z::Union{ZArray,ZGroup})
	z.writeable \|\| throw(Base.IOError("Zarr group is not writeable. Please re-open in write mode to create an array",0))
	consolidate_metadata(z.storage,z.path)
	end

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Undefined error when trying to write to a non-writeable zgroup #199

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Undefined error when trying to write to a non-writeable zgroup #199

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