docs(README): fix title default value in README.md (danilowoz#269)

Summary
Fixes the default value of `title` prop README.md file.  The latest version uses `Loading...` instead of `Loading interface...` as it's default.

Related Issue #[issue number]
Not applicable.

Any Breaking Changes
Not applicable.

Checklist
[] Are all the test cases passing?
[] If any new feature has been added, then are the test cases updated/added?
[] Has the documentation been updated for the proposed change, if required?

Author: jonshuang

README.md

@@ -111,7 +111,7 @@ const MyLoader = () => (
 | <div style="width:250px">Prop name and type</div>                | Environment                | Description                                                                                                                                                                                                                                                                                         |
 | ---------------------------------------------------------------- | -------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | **`animate?: boolean`** <br/> Defaults to `true`                 | React DOM<br/>React Native | Opt-out of animations with `false`                                                                                                                                                                                                                                                                  |
-| **`title?: string`** <br/> Defaults to `Loading interface...`    | React DOM only             | It's used to describe what element it is. <br />Use `''` (empty string) to remove.                                                                                                                                                                                                                  |
+| **`title?: string`** <br/> Defaults to `Loading...`              | React DOM only             | It's used to describe what element it is. <br />Use `''` (empty string) to remove.                                                                                                                                                                                                                  |
 | **`baseUrl?: string`**<br /> Defaults to an empty string         | React DOM only             | Required if you're using `<base url="/" />` document `<head/>`. <br/>This prop is common used as: <br/>`<ContentLoader baseUrl={window.location.pathname} />` which will fill the SVG attribute with the relative path. Related [#93](https://github.com/danilowoz/react-content-loader/issues/93). |
 | **`speed?: number`** <br /> Defaults to `1.2`                    | React DOM<br/>React Native | Animation speed in seconds.                                                                                                                                                                                                                                                                         |
 | **`interval?: number`** <br /> Defaults to `0.25`                | React DOM<br/>React Native | Interval of time between runs of the animation, <br/>as a fraction of the animation speed.                                                                                                                                                                                                          |