added pytest lazy fixture module to requirements.txt

requirements.txt

@@ -16,6 +16,7 @@ py==1.8.1
 pyarrow==0.15.1
 pyparsing==2.4.6
 pytest==5.3.2
+pytest-lazy-fixture==0.6.3
 python-dateutil==2.8.1
 python-intervals==1.10.0
 pytz==2019.3