Fix #247: PropTypes warnings.

[kadishmal]

Fix #247: PropTypes warnings.

[coveralls]

Coverage increased (+1.5%) to 54.839% when pulling 9f60a3c on kadishmal:247 into 42d1a7b on i18next:master.

[kadishmal]

1. @jamuhl how about updating the react dependency as well? In fact all other dependencies.
2. Will up change the version, or should I do that?

[jamuhl]

will check later when out of office and home again - thanks for providing this...really thankful for timesaving - expect it to be published later today.

[jamuhl]

1. updating deps is ok for me - normally i do them pre publish - when doing a minor version (not for all patch versions)

Will update the version of react-i18next before publishing

[jamuhl]

wonder if we should move react and prop-types to peerDependencies

[jamuhl]

just published react-i18next@3.0.0

made it major - so people are aware of needing to have prop-types installed on the main project.

[kadishmal]

@jamuhl agree on moving React and and PropTypes into peer deps. Thanks for the merge!