chore(deps): update dependency typescript to ~3.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
typescript	devDependencies	minor	~3.0.0 -> ~3.1.0	homepage, source

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Release Notes

Microsoft/TypeScript

v3.1.1

Compare Source

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[codecov-io]

Codecov Report

Merging #213 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #213   +/-   ##
=======================================
  Coverage   98.52%   98.52%           
=======================================
  Files          12       12           
  Lines         814      814           
  Branches       65       65           
=======================================
  Hits          802      802           
  Misses         12       12

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