Update dependency eslint-plugin-react to version 6.9.0

[keylocation-bot]

This Pull Request updates dependency eslint-plugin-react from version 6.8.0 to 6.9.0

Changelog

6.9.0 / 2017-01-08
==================

• Added --save-dev to npm install commands in readme
• Merge pull request #1000 from ljharb/fix_node_0_10
  [Fix] Don’t rely on `Array#find` existing pre node 4
• [Fix] Don’t rely on `Array#find` existing pre node 4.
  Fixes #999.
• Merge pull request #995 from rutsky/patch-1
  add missing "react" namespace to "react/forbid-prop-types"
• add missing "react" namespace to "react/forbid-prop-types"
• Merge pull request #992 from taion/991-regression
  Add regression tests for #991
• Add regression for #991
• Update CHANGELOG and bump version
• Fix prop-types to correcly assign props to components (fixes #991)
• Add support for variable reference to sort-prop-types (fixes #622)