fix: add regenerator runtime

[VictorVelarde]

This avoids 'regeneratorRuntime' errors on client applications, like this error running cra - sample app:

oauthSlice.js:70 Uncaught ReferenceError: regeneratorRuntime is not defined
    at eval (oauthSlice.js:70)
    at eval (oauthSlice.js:103)
    at Object.srcReduxOauthSliceJs [as ./src/redux/oauthSlice.js] (index.js:112)
    at __webpack_require__ (index.js:284)
    at eval (OAuthLogin.js:14)
    at Object.srcOauthOAuthLoginJs [as ./src/oauth/OAuthLogin.js] (index.js:47)
    at __webpack_require__ (index.js:284)
    at eval (index.js:8)
    at Object.srcOauthIndexJs [as ./src/oauth/index.js] (index.js:63)
    at __webpack_require__ (index.js:284)