fix(resizable-directive): browser check for angular universal

[philip-firstorder]

Because it doesn't know what document is
Fixes 'ReferenceError: document is not defined'

[mattlewis92]

Thanks for this! Looks like it was working until the previous version, I should probably try and add a universal smoke test to the CI build somewhere to prevent this happening again

[codecov-io]

Codecov Report

Merging #83 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   95.94%   95.97%   +0.02%     
==========================================
  Files           4        4              
  Lines         296      298       +2     
  Branches       29       29              
==========================================
+ Hits          284      286       +2     
  Misses          8        8              
  Partials        4        4

Impacted Files	Coverage Δ
src/resizable.directive.ts	95.75% <100%> (+0.03%)	⬆️

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[philip-firstorder]

All fixed. If you would be so kind to merge and release, you‘ll get a virtual beer directly from the Oktoberfest brewery next to me.

[mattlewis92]

Perfect, thank you! Cutting a new release momentarily 🎉