Fix MySQL minimal requirement (#1794)

* Fix MySQL minimal requirement

* Fix MySQL minimal requirement on french docs

docs/en/admins/02_Installation.md

@@ -9,7 +9,7 @@ You need to verify that your server can run FreshRSS before installing it. If yo
 | Web server  | **Apache 2**     | Nginx                         |
 | PHP         | **PHP 5.5+**     | PHP 5.3.8+                    |
 | PHP modules | Required: libxml, cURL, PDO_MySQL, PCRE and ctype. \\ Required (32-bit only): GMP \\Recommanded: JSON, Zlib, mbstring, iconv, ZipArchive | |
-| Database    | **MySQL 5.0.3+** | SQLite 3.7.4+                 |
+| Database    | **MySQL 5.5.3+** | SQLite 3.7.4+                 |
 | Browser     | **Firefox**      | Chrome, Opera, Safari, or IE11+ |
 
 ## Important notice

docs/fr/users/01_Installation.md

@@ -9,7 +9,7 @@ Il est toutefois de votre responsabilité de vérifier que votre hébergement pe
  | Serveur web      | **Apache 2**                                                                                                   | Nginx                          |
  | PHP              | **PHP 5.5+**                                                                                                   | PHP 5.3.8+                     |
  | Modules PHP      | Requis : libxml, cURL, PDO_MySQL, PCRE et ctype \\ Requis (32 bits seulement) : GMP \\ Recommandé : JSON, Zlib, mbstring et iconv, ZipArchive |                                |
- | Base de données  | **MySQL 5.0.3+**                                                                                               | SQLite 3.7.4+                  |
+ | Base de données  | **MySQL 5.5.3+**                                                                                               | SQLite 3.7.4+                  |
  | Navigateur       | **Firefox**                                                                                                    | Chrome, Opera, Safari, or IE 11+ |
 
 ## Note importante