Write fix for Julia v0.7

Removes ::AbstractVector{Record}, which is neither captured for other versions of Julia.

Author: CiaranOMara

src/writer.jl

@@ -1,5 +1,5 @@
 "Write [`Record`](@ref)s to `IO` as string."
-function Base.write(io::IO, records::Union{Vector{Record}, <:AbstractVector{Record}}) #Note: catching non-isbits arrays and we assume the indexes have been bumpped and the open ends are correct.
+function Base.write(io::IO, records::Vector{Record}) #Note: catching non-isbits arrays and we assume the indexes have been bumpped and the open ends are correct.
     for record in records
         Base.write(io, record, '\n')
     end

test/runtests.jl

@@ -149,6 +149,17 @@ end
 	@test Bag.records == read(io, Vector{Record})
 end
 
+# Not able to capture write(::IO, ::AbstractVector).
+# @test_nowarn mktemp() do path, io
+# 	# test AbstractVector
+# 	records = view(Bag.records, 2:4)
+# 	header = Bedgraph.generateBasicHeader(records)
+#     write(io, header, records)
+#
+# 	seekstart(io)
+# 	@test records == read(io, Vector{Record})
+# end
+
 @test_nowarn mktemp() do path, io
 	header = Bedgraph.generateBasicHeader("chr19", Bag.records[1].first, Bag.records[end].last, bump_forward=false)
 	write(io, header, Bag.records)