Added individual flag methods to readme
Merge branch 'master' of https://github.com/Financial-Times/next-feature-flags-client into singleton

* 'master' of https://github.com/Financial-Times/next-feature-flags-client:
  Added individual flag methods to readme

Conflicts:
	README.md
Merge branch 'singleton' of https://github.com/Financial-Times/next-feature-flags-client into singleton

* 'singleton' of https://github.com/Financial-Times/next-feature-flags-client:
  Changed advice on use of flags.get()

Conflicts:
	README.md