add imperva to CDN

diagrams/saas/cdn.py

@@ -20,4 +20,8 @@ class Fastly(_Cdn):
     _icon = "fastly.png"
 
 
+class Imperva(_Cdn):
+    _icon = "imperva.png"
+
+
 # Aliases

docs/nodes/saas.md

@@ -53,6 +53,9 @@ Node classes list of the saas provider.
 <img width="30" src="/img/resources/saas/cdn/fastly.png" alt="Fastly" style="float: left; padding-right: 5px;" >
 **diagrams.saas.cdn.Fastly**
 
+<img width="30" src="/img/resources/saas/cdn/imperva.png" alt="Imperva" style="float: left; padding-right: 5px;" >
+**diagrams.saas.cdn.Imperva**
+
 ## saas.chat