Exclude Tests files in PHAR archive

[zonuexe]

Excluding the test code reduces the file size of the archive slightly.

% ls -la build/*.phar
-rwxr-xr-x  1 megurine  staff  5214175 11 16 00:02 build/before.phar
-rwxr-xr-x  1 megurine  staff  4551252 11 16 00:03 build/after.phar

% ls -lah build/*.phar
-rwxr-xr-x  1 megurine  staff   5.0M 11 16 00:02 build/before.phar
-rwxr-xr-x  1 megurine  staff   4.3M 11 16 00:03 build/after.phar

See the Gist below for a list of files included in the archive:
https://gist.github.com/zonuexe/f378b2d966f2c4c3497af1343451ecaf#file-diff-patch

[dantleech]

thanks!