fix missing virtual dtor on observable_reader_node #211
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This commit fixes an issue where the observable_reader_node, which serve as a base class for reader_node, didn't have a virtual dtor.
This was made easier to miss in virtue of observable_reader_node not having any virtual method.
By having observable_reader_node derive from reader_node_base, we effectively fix the issue and by removing multiple inheritance. observable_reader_node now inherits its virtual dtor from reader_node_base.