Uptade README.md

Added a coma to this line: 
"Every piece of logic, which doesn't belong to the components described above, should be placed inside a service."

Author: octaviocarpes

README.md

@@ -234,7 +234,7 @@ function MyCtrl(uppercaseFilter) {
 
 ### Services
 
-Every piece of logic, which doesn't belong to the components described above should be placed inside a service. Usually services encapsulate the domain specific logic, persistence logic, XHR, WebSockets, etc. When the controllers in the application became too "fat" the repetitive code should be placed inside a service.
+Every piece of logic, which doesn't belong to the components described above, should be placed inside a service. Usually services encapsulate the domain specific logic, persistence logic, XHR, WebSockets, etc. When the controllers in the application became too "fat" the repetitive code should be placed inside a service.
 
 ```JavaScript
 myModule.service('Developer', function () {