feat(react): allow deprecated react methods and update eslint dep

BREAKING CHANGE: The change to the camelcase rule requires ESLint 5.7.0
so that's now the minimum specified in peerDependencies.

package.json

@@ -29,7 +29,7 @@
   },
   "peerDependencies": {
     "babel-eslint": ">=8.0.1",
-    "eslint": ">=5.3.0"
+    "eslint": ">=5.7.0"
   },
   "devDependencies": {
     "babel-eslint": "10.0.3",

react.js

@@ -55,7 +55,10 @@ module.exports = {
         'react/jsx-tag-spacing': [2],
         'react/jsx-uses-react': [2],
         'react/jsx-uses-vars': [2],
-        'react/jsx-wrap-multilines': [2]
+        'react/jsx-wrap-multilines': [2],
+
+        // Allow deprecated lifecycle methods
+        'camelcase': [2, {allow: ['^UNSAFE_']}]
     },
     plugins: ['react'],
     extends: ['plugin:react/recommended']