update typescript to 2.3.2

[agubler]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

Upgrade typescript to 2.3.2

Resolves #49

[codecov]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   96.05%   96.05%           
=======================================
  Files           2        2           
  Lines          76       76           
  Branches       24       24           
=======================================
  Hits           73       73           
  Misses          1        1           
  Partials        2        2

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