expose MessageSourceContext Consumer as part of the public API

Author: oliverlaz

src/index.js

@@ -1,7 +1,7 @@
 /**
  * The Public API.
  */
-export { Provider } from './lib/MessageSourceContext';
+export { Provider, Consumer } from './lib/MessageSourceContext';
 export { FetchingProvider } from './lib/FetchingProvider';
 export { useMessageSource } from './lib/useMessageSource';
 export { withMessages } from './lib/withMessages';

src/lib/MessageSourceContext.js

@@ -25,4 +25,4 @@ export { MessageSourceContext };
  *   ...
  * </MessageSource.Provider>
  */
-export const { Provider } = MessageSourceContext;
+export const { Provider, Consumer } = MessageSourceContext;