Lighten peer dependency version further

[brandongregoryscott]

Just got around to updating a client project to the latest version of Core & React, as well as upgrading axios. I am getting a warning from npm about a missing peer dependency, despite having a higher version of axios installed:

npm WARN andculturecode-javascript-core@0.6.0 requires a peer of axios@^0.19.2 but none is installed. You must install peer dependencies yourself.

package.json:

"axios": "0.21.1",

We may want to provide a range of tested versions, ie 0.19 - 0.21, or perhaps an or: 0.19 || 0.21