Update deprecated setupTestFrameworkScriptFile. (What's A Blog Post On A Website)

Update enzyme configuration in Jest. `setupTestFrameworkScriptFile` is deprecated in favor of `setupFilesAfterEnv`. [How To Start A Blog Writing docs)

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7-testing/7.3-enzyme-testing.md

@@ -25,7 +25,7 @@ The default react-native boilerplate comes with Jest. Integrating Enzyme with Je
  ...,
  "jest": {
  ...,
- "setupTestFrameworkScriptFile": "./node_modules/jest-enzyme/lib/index.js",
+ "setupFilesAfterEnv": ["./node_modules/jest-enzyme/lib/index.js"],
  "setupFiles": ["enzyme-react-16-adapter-setup"]
  }
  }