Update README.md

Author: agapoff

README.md

@@ -25,10 +25,12 @@ Nagios-style checks against Kubernetes API. Designed for usage with Nagios, Icin
 	                    - TLS expiration days for TLS mode; default is 30
 	                    - Pod restart count in pods mode; default is 30
 	                    - Job failed count in jobs mode; default is 1
+	                    - Pvc storage utilization; default is 80%
 	  -c CRIT          Critical threshold for
 	                    - Pod restart count (in pods mode); default is 150
 	                    - Unbound Persistent Volumes in unboundpvs mode; default is 5
 	                    - Job failed count in jobs mode; default is 2
+	                    - Pvc storage utilization; default is 90%
 	  -b               Brief mode (more suitable for Zabbix)
 	  -M EXIT_CODE     Exit code when resource is missing; default is 2 (CRITICAL)
 	  -h               Show this help and exit
@@ -43,6 +45,7 @@ Nagios-style checks against Kubernetes API. Designed for usage with Nagios, Icin
 	  replicasets      Check for replicasets readiness
 	  statefulsets     Check for statefulsets readiness
 	  tls              Check for tls secrets expiration dates
+	  pvc              Check for pvc utilization
 	  unboundpvs       Check for unbound persistent volumes.
 	  components       Check for health of k8s components (Deprectaed in K8s 1.19+)