Migrate to hooks

Migrate ld-react to use hooks:

• withFlagProvider becomes useLaunchDarkly
• withFlags becomes useFlags

Fixed deprecated default export warning and upgrades

• Fixed ldclient-js warning re deprecated default export:

[LaunchDarkly] "default export" is deprecated, please use "named LDClient export"

• Npm package upgrades

Replaced lodash dependency with camelcase. Package upgrades.

• Replaced lodash dependency with camelcase
• Package upgrades: latest ldclient-js and babel.

Release 1.0.0

First release.