Add node_modules to .eslintignore

[bmish]

I saw something in this folder getting linted locally.

[aladdin-add]

I don't think it's needed, as eslint ignores node_modules/ by default.

In addition to any patterns in the .eslintignore file, ESLint always follows a couple of implicit ignore rules even if the --no-ignore flag is passed. The implicit rules are as follows:

• node_modules/ is ignored.
• dot-files (except for .eslintrc.*), as well as dot-folders and their contents, are ignored.

https://eslint.org/docs/user-guide/configuring/ignoring-code#the-eslintignore-file

[bmish]

@aladdin-add that's what I thought. I figured out the actual issue though and opened up a replacement fix: #154