fix build: fastavro dropped py27 after 0.24.2
@@ -10,7 +10,8 @@ SQLAlchemy==1.3.6
Whoosh==2.7.4
xlrd==1.2.0
xlwt==1.3.0
-fastavro>=0.24
+fastavro>=0.24.2 ; python_version >= '3.4'
+fastavro==0.24.2 ; python_version < '3.0'
smbprotocol>=1.0.1
requests; python_version >= '3.4'
fsspec>=0.7.4 ; python_version >= '3.4'
