CE wrapper Source attr update

Author: tzununbekov

go.sum

@@ -3,42 +3,54 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
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@@ -59,6 +71,7 @@ golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -69,13 +82,16 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -84,10 +100,14 @@ google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRn
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pkg/events/cloudevents/mapper.go

@@ -11,7 +11,7 @@ import (
 // CloudEvent is a data structure required to map KLR responses to cloudevents
 type CloudEvent struct {
 	EventType string `envconfig:"type" default:"ce.klr.triggermesh.io"`
-	Source    string `envconfig:"k_service" default:"knative-lambda-runtime"`
+	Source    string `envconfig:"source" default:"knative-lambda-runtime"`
 	Subject   string `envconfig:"subject" default:"klr-response"`
 }