trafaret compatibility fixes

Author: popravich

aiohttp_admin/backends/mongo_utils.py

@@ -123,6 +123,4 @@ def create_validator(schema, primary_key):
     # create validator without primary key, used for update queries
     # where pk supplied in url and rest in body
     keys = [s for s in schema.keys if s.get_name() != primary_key]
-    new_schema = t.Dict({})
-    new_schema.keys = keys
-    return new_schema.ignore_extra(primary_key)
+    return t.Dict().merge(keys).ignore_extra(primary_key)

requirements-dev.txt

@@ -14,6 +14,6 @@ pytest-sugar==0.9.2
 pytest==4.2.0
 python-dateutil==2.8.0
 sqlalchemy==1.2.17
-trafaret==2.0.0a1
+trafaret==1.2.0
 pymysql==0.9.3
 -r requirements-doc.txt