Gem bloat

[dim]

Version 1.2.x has unnecessary files in the gem:

ls -lah ./vendor/bundle/ruby/2.6.0/gems/grape-1.2.4/pkg/
total 3M     
drwxr-xr-x    2 root     root        4.0K Nov 28 10:33 .
drwxr-xr-x    7 root     root        4.0K Nov 28 10:33 ..
-rw-rw-r--    1 root     root      638.0K Nov 28 10:33 grape-1.2.0.gem
-rw-rw-r--    1 root     root      851.0K Nov 28 10:33 grape-1.2.1.gem
-rw-rw-r--    1 root     root        1.7M Nov 28 10:33 grape-1.2.3.gem

[dblock]

Good catch. I put in a fix in #1937.