Update typeahead.directive.ts

[Mohdplunk]

allow the directive to be exported

[codecov-io]

Codecov Report

Merging #1783 into development will not change coverage.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           development    #1783   +/-   ##
============================================
  Coverage        85.47%   85.47%           
============================================
  Files               85       85           
  Lines             2292     2292           
  Branches           300      300           
============================================
  Hits              1959     1959           
  Misses             234      234           
  Partials            99       99

Impacted Files	Coverage Δ
src/typeahead/typeahead.directive.ts	76.27% <100%> (ø)	⬆️

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[valorkin]

thanks