React 15.2.0 发布，React 和 React

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　　React 15.2.0 发布了。
　　本次发布改进日志如下：

• 　　Add error codes to production invariants, with links to the view the full error text. (@keyanzhang in #6948)
  
• 　　Include component stack information in PropType validation warnings. (@spicyj in #6771)
  
• 　　Include component stack information in key warnings. (@keyanzhang in #6799)
  
• 　　Stop validating props at mount time, only validate at element creation. (@keyanzhang in #6823)
  
• 　　New invariant providing actionable error in missing instance case. (@yungsters in #6990)
  
• 　　Add React.PropTypes.symbol to support ES2015 Symbols as props. (@puradox in #6377)
  
• 　　Fix incorrect coercion of ref or key that are undefined in development (@gaearon in #6880)
  
• 　　Fix a false positive when passing other element’s props to cloneElement (@ericmatthys in #6268)
  

React DOM

• 　　Add warning for unknown properties on DOM elements. (@jimfb in #6800, @gm758 in #7152)
  
• 　　Properly remove attributes from custom elements. (@grassator in #6748)
  
• 　　Fix invalid unicode escape in attribute name regular expression. (@nbjahan in #6772)
  
• 　　Add onLoad handling to  element. (@roderickhsiao in #6815)
  
• 　　Add onError handling to  element. (@wadahiro in #6941)
  
• 　　Handle value and defaultValue more accurately in the DOM. (@jimfb in #6406)
  
• 　　Fix events issue in environments with mutated Object.prototype. (@Weizenlol in #6886)
  
• 　　Fix issue where is="null" ended up in the DOM in Firefox. (@darobin in #6896)
  
• 　　Improved performance of text escaping by using escape-html. (@aickin in #6862)
  
• 　　Fix issue with dangerouslySetInnerHTML and SVG in Internet Explorer. (@joshhunt in #6982)
  
• 　　Fix issue with  placeholders. (@jimfb in #7002)
  
• 　　Fix controlled vs uncontrolled detection of . (@jimfb in #7003)
  
• 　　Improve performance of updating text content. (@trueadm in #7005)
  
• 　　Ensure controlled  components behave the same on initial render as they do on updates. (@yiminghe in #5362)
  

React Perf Add-on

• 　　Add isRunning() API. (@nfcampos in #6763)
  
• 　　Improve accuracy of lifecycle hook timing. (@gaearon in #6858)
  
• 　　Fix internal errors when using ReactPerf with portal components. (@gaearon in #6860)
  
• 　　Fix performance regression. (@spicyj in #6770)
  
• 　　Add warning that ReactPerf is not enabled in production. (@sashashakun in #6884)