[MonologBundle] Fix schema XML (_ -> -)

src/Symfony/Bundle/MonologBundle/Resources/config/schema/monolog-1.0.xsd

@@ -34,10 +34,10 @@
         <xsd:attribute name="buffer-size" type="xsd:integer" />
         <xsd:attribute name="max-files" type="xsd:integer" />
         <xsd:attribute name="handler" type="xsd:string" />
-        <xsd:attribute name="from_email" type="xsd:string" />
-        <xsd:attribute name="to_email" type="xsd:string" />
+        <xsd:attribute name="from-email" type="xsd:string" />
+        <xsd:attribute name="to-email" type="xsd:string" />
         <xsd:attribute name="subject" type="xsd:string" />
-        <xsd:attribute name="email_prototype" type="xsd:string" />
+        <xsd:attribute name="email-prototype" type="xsd:string" />
         <xsd:attribute name="formatter" type="xsd:string" />
     </xsd:complexType>