Add rule to enforce spacing in curly brackets in JSX children

This required an updated in version of eslint-plugin-react to 7.4.0.

package.json

@@ -39,6 +39,7 @@
     "start": "parallelshell \"npm run build:watch\" \"npm run reskindex:watch\"",
     "lint": "eslint src/",
     "lintall": "eslint src/ test/",
+    "lintwithexclusions": "eslint --max-warnings 0 --ignore-path .eslintignore.errorfiles src test",
     "clean": "rimraf lib",
     "prepublish": "npm run clean && npm run build && git rev-parse HEAD > git-revision.txt",
     "test": "karma start --single-run=true --browsers ChromeHeadless",
@@ -99,7 +100,7 @@
     "eslint-config-google": "^0.7.1",
     "eslint-plugin-babel": "^4.0.1",
     "eslint-plugin-flowtype": "^2.30.0",
-    "eslint-plugin-react": "^6.9.0",
+    "eslint-plugin-react": "^7.4.0",
     "expect": "^1.16.0",
     "json-loader": "^0.5.3",
     "karma": "^1.7.0",