Fix installation failure due to the lack of shebang.

[alpharder]

Summary of changes

Last release installation fails due to inability to install type compiler.
This PR adds required shebang

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[alpharder]

@marcj You may want to issue a new release containing this change because npm init @deepkit/app my-deepkit-app command listed on website fails

[codecov-commenter]

Codecov Report

Merging #497 (f54134c) into master (aa66460) will not change coverage.
The diff coverage is n/a.

❗ Current head f54134c differs from pull request most recent head e190142. Consider uploading reports for the commit e190142 to get more accurate results

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@@           Coverage Diff           @@
##           master     #497   +/-   ##
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  Coverage   77.83%   77.83%           
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  Files         184      184           
  Lines       19604    19604           
  Branches     5057     5057           
=======================================
  Hits        15259    15259           
  Misses       4345     4345           

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[marcj]

Thanks @alpharder !