[skip ci] Autogenerate README file.

Author: tedium-bot

README.md

@@ -39,9 +39,10 @@ for `suffix`).
     </paper-input>
 
 A `paper-input` can use the native `type=search` or `type=file` features.
-However, since we can't control the native styling of the input, in these cases
-it's recommended to use a placeholder text, or `always-float-label`,
-as to not overlap the native UI (search icon, file button, etc.).
+However, since we can't control the native styling of the input (search icon,
+file button, date placeholder, etc.), in these cases the label will be
+automatically floated. The `placeholder` attribute can still be used for
+additional informational text.
 
     <paper-input label="search!" type="search"
         placeholder="search for cats" autosave="test" results="5">