Fixed code blocks in readme.

README.rst

@@ -223,42 +223,39 @@ Features
 
 * Lazy loading, best for circular references:
 
-  ..code-block:: python
-
-    class Primary(models.Base):
-
-        name = fields.StringField()
-        secondary = fields.EmbeddedField('Secondary')
-
+  .. code-block:: python
 
-    class Secondary(models.Base):
+    >>> class Primary(models.Base):
+    ...
+    ...     name = fields.StringField()
+    ...     secondary = fields.EmbeddedField('Secondary')
 
-        data = fields.IntField()
-        first = fields.EmbeddedField('Primary')
+    >>> class Secondary(models.Base):
+    ...
+    ...    data = fields.IntField()
+    ...    first = fields.EmbeddedField('Primary')
 
   You can use either `Model`, full path `path.to.Model` or relative imports
   `.Model` or `...Model`.
 
 * Using definitions to generate schema for circular references:
 
-  ..code-block:: python
-
-    class File(models.Base):
-
-        name = fields.StringField()
-        size = fields.FloatField()
-
-
-    class Directory(models.Base):
-
-        name = fields.StringField()
-        children = fields.ListField(['Directory', File])
+  .. code-block:: python
 
+    >>> class File(models.Base):
+    ...
+    ...     name = fields.StringField()
+    ...     size = fields.FloatField()
 
-    class Filesystem(models.Base):
+    >>> class Directory(models.Base):
+    ...
+    ...     name = fields.StringField()
+    ...     children = fields.ListField(['Directory', File])
 
-        name = fields.StringField()
-        children = fields.ListField([Directory, File])
+    >>> class Filesystem(models.Base):
+    ...
+    ...     name = fields.StringField()
+    ...     children = fields.ListField([Directory, File])
 
     >>> Filesystem.to_json_schema()
     {