update filename querying to use new syntax

This was a breaking change introduced by JuliaIO/FileIO.jl#181

Author: tlnagy

src/loader.jl

@@ -5,7 +5,7 @@ function load(f::File{format"OMETIFF"})
 end
 
 function load(io::Stream{format"OMETIFF"})
-    if !contains(get(io.filename), ".ome.tif") && !contains(get(io.filename), ".ome.tiff")
+    if io.filename != nothing && !contains(io.filename, ".ome.tif")
         throw(FileIO.LoaderError("OMETIFF", "Not an OME TIFF file!"))
     end
 

src/utils.jl

@@ -47,4 +47,4 @@ end
 Extract the name of the file backing a stream
 """
 extract_filename(io::IOStream) = split(io.name, " ")[2][1:end-1]
-extract_filename(io::Stream) = get(io.filename)
+extract_filename(io::Stream) = io.filename