Add server.d.ts to .npmignore

[lucasterra]

#95 broke TS Definitions for loadable-components/server. That's because server.d.ts is not being exported on npm publish.

This fixes this #112

[codecov]

Codecov Report

Merging #113 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #113   +/-   ##
=======================================
  Coverage   90.45%   90.45%           
=======================================
  Files          15       15           
  Lines         199      199           
  Branches       54       54           
=======================================
  Hits          180      180           
  Misses         17       17           
  Partials        2        2

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[gregberge]

Good catch, thanks!