"Merge pull request #465 from avborhanian/patch-1\n\nMade sure to clo…

…se out the sourcemap_file"

src/webassets/filter/compass.py

@@ -242,6 +242,7 @@ def open(self, out, source_path, **kw):
                     os.mkdir(path.dirname(sourcemap_output_filepath))
                 sourcemap_output_file = open(sourcemap_output_filepath, 'w')
                 sourcemap_output_file.write(sourcemap_file.read())
+                sourcemap_file.close()
             try:
                 contents = output_file.read()
                 out.write(contents)