Add canva (#2950)

* Add canva

* category-companies: include canva

data/canva

@@ -0,0 +1,7 @@
+# affinity
+affinity.api.serifservices.com
+affinity.studio
+affinity-beta.s3.amazonaws.com
+affinity-lessons.s3.amazonaws.com
+
+canva.com

data/category-companies

@@ -17,6 +17,7 @@ include:bandwagonhost
 include:blurams
 include:broadcom
 include:canon
+include:canva
 include:chegg
 include:cisco
 include:cloudcone