Lock version of mongodb module to "2.2.22".

[raghav135]

No description provided.

[raghav135]

Fix for issue #10

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@b646404). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #11   +/-   ##
=========================================
  Coverage          ?   79.05%           
=========================================
  Files             ?        1           
  Lines             ?      148           
  Branches          ?       17           
=========================================
  Hits              ?      117           
  Misses            ?       16           
  Partials          ?       15

Impacted Files	Coverage Δ
source/index.coffee	79.05% <ø> (ø)

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