add syntax highlighting

Adding-counts-to-DjangoFilterConnectionField.md

@@ -4,7 +4,7 @@ The trick here is to subclass `Connection` and declare a `connection_class` on y
 
 You can now easily implement counts (or really anything) on your extended `Connection` class and use them in your queries, while retaining the built-in filtering that comes with `DjangoFilterConnectionField`:
 
-```
+```python
 from graphene import ObjectType, Connection, Node, Int
 from graphene_django import DjangoObjectType
 from graphene_django.filter import DjangoFilterConnectionField
@@ -57,7 +57,7 @@ This allows, on this example `schema`, querying:
 ```
 
 Which returns:
-```
+```json
 {
   "data": {
     "places": {