Reorganize adding handlers to allow for reuse#116

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realumhelp wants to merge 1 commit intoalexgolec:masterfrom

realumhelp:fix-streaming-docs

Commits on Oct 2, 2020

Moved add_nasdaq_book_handler out of read_stream() to allow users to call read_stream again if the stream fails and prevent them from erroneously adding an extra handler.
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