Update Mongo driver to 2.0+

[johnnason]

Connects to #107

[epaolillo]

Hi, is it still maintained? if so - I got this error while trying to import on every table. Using Ryby 2.7 and your cloned MoSQL and Mongoriver

2: from /usr/local/bundle/gems/sequel-5.30.0/lib/sequel/connection_pool/threaded.rb:92:in hold' 1: from /usr/local/bundle/gems/mosql-0.5.0/lib/mosql/schema.rb:301:in block in copy_data'
/usr/local/bundle/gems/mosql-0.5.0/lib/mosql/schema.rb:301:in `check': ERROR: duplicate key value violates unique constraint "games_pkey" (PG::UniqueViolation)
DETAIL: Key (_id)=(\x356366393066303331356261373630666561326537643163) already exists.
CONTEXT: COPY games, line 729

Do you find any solution?

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