Revert also the custom "as" propType which is needed for the Popup

reviewed by tpe + akr

Author: Tolomej Paulke

package.json

@@ -1,6 +1,6 @@
 {
   "name": "semantic-ui-react",
-  "version": "0.88.2-legacy-popup",
+  "version": "0.88.2-legacy-popup-1",
   "description": "The official Semantic-UI-React integration.",
   "jsnext:main": "dist/es/index.js",
   "main": "dist/commonjs/index.js",

src/lib/customPropTypes.js

@@ -4,6 +4,14 @@ import leven from './leven'
 
 const typeOf = (...args) => Object.prototype.toString.call(...args)
 
+/**
+ * Ensure a component can render as a give prop value.
+ */
+export const as = (...args) =>
+  PropTypes.oneOfType([PropTypes.func, PropTypes.object, PropTypes.string, PropTypes.symbol])(
+    ...args,
+  )
+
 /**
  * Ensure a prop is a valid DOM node.
  */