committing pesky LICENSE.pdf, which git thinks I've changed

[rkorte]

Please approve this PR to see if it removes my issue with LICENSE.pdf every time I work in the rticonnextdds-connector-js repository. (I'm not sure if this PR will work because git harasses me about LICENSE.pdf even when I git clone an entirely clean connector repo.) Sam said I could try this.

Here's a description of the problem again:

I do this (while in develop or master, I can't remember which):
git checkout feature/CON-215-herculesReleaseNotes
Git says this:
error: Your local changes to the following files would be overwritten by checkout: LICENSE.pdf Please commit your changes or stash them before you switch branches. Aborting

I do this:
git stash
Git does this:
Saved working directory and index state WIP on master: 7bb63c4 Update package.json for 1.0.0 Encountered 1 file(s) that should have been pointers, but weren't: LICENSE.pdf

I do this:
git checkout feature/CON-215-herculesReleaseNotes
Git does this:
error: Your local changes to the following files would be overwritten by checkout: LICENSE.pdf Please commit your changes or stash them before you switch branches. Aborting

Wash, rinse, repeat.

[samuelraeburn]

See #32

[samuelraeburn]

This seems to be fixed by fixing the gitattributes (in PR #32). Going to close this review for now, can reopen it if the problem returns.