Bring back StaticStringy as a __callStatic wrapper

README.md

@@ -94,6 +94,7 @@ s('string')->toTitleCase()->ensureRight('y') == 'Stringy'
     * [underscored](#underscored)
     * [upperCamelize](#uppercamelize)
     * [upperCaseFirst](#uppercasefirst)
+* [StaticStringy](#staticstringy)
 * [Extensions](#extensions)
 * [Tests](#tests)
 * [License](#license)
@@ -947,6 +948,19 @@ Converts the first character of the supplied string to upper case.
 s('σ foo')->upperCaseFirst(); // 'Σ foo'
 ```
 
+## StaticStringy
+
+A static wrapper exists for Stringy methods. All the methods list under
+"Instance methods" are available. For StaticStringy method, the optional
+encoding is expected to be the last argument. The result is not cast, so
+the return value may be of type Stringy, integer, boolean, etc.
+
+```php
+// Translates to Stringy::create('fòôbàř', 'UTF-8')->slice(0, 3);
+StaticStringy::slice('fòôbàř', 0, 3, 'UTF-8');
+```
+
+
 ## Extensions
 
 The following is a list of libraries that extend Stringy: