update README

README.markdown

@@ -34,12 +34,12 @@ The module requires Puppet 4.x and currently supports only Debian 8 "Jessie" (an
 ### Beginning with proxysql
 
 To install the ProxySQL software with all the default options:
-```
+```puppet
 include ::proxysql
 ```
 
 You can customize options such as (but not limited to) `listen_port`, `admin_password`, `monitor_password`, ...
-```
+```puppet
   class { '::proxysql':
     listen_port              => 3306,
     admin_password           => '654321',
@@ -60,7 +60,7 @@ You can customize options such as (but not limited to) `listen_port`, `admin_pas
 ```
 
 You can configure users\hostgroups\rules\schedulers using class parameters
-```
+```puppet
   class { '::proxysql':
   mysql_servers    => [ { 'db1' => { 'port'      => 3306,
                                   'hostgroup_id' => 1, } },
@@ -87,7 +87,7 @@ You can configure users\hostgroups\rules\schedulers using class parameters
 ```
 
 Or by using individual resources:
-```
+```puppet
   class { '::proxysql':
     listen_port    => 3306,
     admin_password => 'SuperSecretPassword',
@@ -165,7 +165,7 @@ Or by using individual resources:
 ```
 
 On `Yum` based systems you can do and the module will install ProxySQL from the Percona repo's.
-```
+```puppet
 class { '::proxysql':
   listen_port              => 3306,
   admin_password           => '654321',
@@ -182,7 +182,7 @@ Configuration is done by the `proxysql` class.
 
 You can override any configuration setting by using the `override_config_settings` hash. This hash resembles the structure of the `proxysql.cnf` file
 
-```
+```puppet
 {
     admin_variables => {
       refresh_interval => 2000,