Fixes a problem due to a breaking TS change

[ryan-bradford]

Description

Fixes a problem where a getter was not being compiled to a readonly in the .d.ts files. This causes the error that error TS1086: An accessor cannot be declared in an ambient context.. This is because of a TS breaking change microsoft/TypeScript#33939.

Testing

Inspected the TS output and made sure it did not contain any getters.

Signed-off-by: Ryan Bradford [email protected]

[codecov]

Codecov Report

Merging #187 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #187   +/-   ##
=======================================
  Coverage   90.39%   90.39%           
=======================================
  Files          83       83           
  Lines        2894     2894           
  Branches      457      457           
=======================================
  Hits         2616     2616           
  Misses        183      183           
  Partials       95       95           

Impacted Files	Coverage Δ
...s/i18n/src/lib/service/mock-translation-service.ts	87.50% <100.00%> (ø)

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