Updated dependencies

Author: sergeyklay

README.md

@@ -30,6 +30,7 @@ Please write us if you have any feedback.
 To run this library on your project, you need at least:
 
 * PHP >= 5.4
+* PHP mbstring extension
 
 ### Installation
 

composer.json

@@ -16,10 +16,12 @@
     ],
     "support": {
         "source": "https://github.com/phalcongelist/php-diff",
-        "issues": "https://github.com/phalcongelist/php-diff/issues"
+        "issues": "https://github.com/phalcongelist/php-diff/issues",
+        "wiki": "https://github.com/phalcongelist/php-diff/wiki"
     },
     "require": {
-        "php": ">= 5.4"
+        "php": ">= 5.4",
+        "ext-mbstring": "*"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "~2.6"