fixed requirements

requirements.txt

@@ -1,4 +1,5 @@
 etcd3==0.12.0
 pyroute2==0.6.4
+PyYAML==5.4.1
 scapy==2.4.5
 tenacity==6.1.0

vipman.py

@@ -8,13 +8,13 @@ import subprocess
 import sys
 from time import sleep
 import uuid
-import yaml
 
+import etcd3
 from pyroute2 import NDB, config
 config.cache_expire = -1
 from scapy.all import ARP, Ether, sendp, conf
 conf.verb = 0
-import etcd3
+import yaml
 
 parser = argparse.ArgumentParser(description='vipman - etcd based virtual ip manager')
 parser.add_argument('-c', '--config', default='/etc/vipman/vipman.yaml', help='config file')