rollup sourcemaps and es2015 modules

[scttcper]

closes #104

[codecov]

Codecov Report

Merging #120 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #120   +/-   ##
=======================================
  Coverage   78.55%   78.55%           
=======================================
  Files          16       16           
  Lines         485      485           
  Branches       61       61           
=======================================
  Hits          381      381           
  Misses         58       58           
  Partials       46       46

Impacted Files	Coverage Δ
src/lib/toastr/toast-component.ts	82.14% <ø> (ø)
src/lib/toastr/toast-injector.ts	91.89% <ø> (ø)
src/lib/overlay/overlay.ts	80% <ø> (ø)	⬆️
src/lib/toastr/toast-directive.ts	70% <ø> (ø)
src/lib/toastr/toastr-config.ts	84.9% <ø> (ø)
src/app/pink.toast.ts	50% <100%> (ø)	⬆️
src/lib/toastr/toastr-service.ts	58% <100%> (ø)
src/lib/index.ts	100% <100%> (ø)
src/lib/toastr/toastr-module.ts	100% <100%> (ø)
src/app/app.component.ts	84.44% <100%> (ø)	⬆️
... and 1 more

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