Bootstrap dependency is pinned to an insecure version of bootstrap

[cjcodes]

Expected Behavior

npm audit should pass

Current Behavior

npm audit shows a vulnerability in 4.1.3:

┌───────────────┬──────────────────────────────────────────────────────────────┐
│ Moderate      │ Cross-Site Scripting                                         │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Package       │ bootstrap                                                    │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Patched in    │ >=3.4.1 <4.0.0 || >=4.3.1                                    │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Dependency of │ shards-react                                                 │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ Path          │ shards-react > shards-ui > bootstrap                         │
├───────────────┼──────────────────────────────────────────────────────────────┤
│ More info     │ https://npmjs.com/advisories/891                             │
└───────────────┴──────────────────────────────────────────────────────────────┘

Possible Solution

Upgrade bootstrap to >= 4.3.1

Steps to Reproduce

1. Install shards-react or any other module that depends on this repo
2. Run npm audit

[cjcodes]

I would PR this, but I dunno how to manually verify that there are no regressions.

[cookieshell]

Fixed in #57