doc for hashCodeByValue

go.mod

@@ -3,9 +3,6 @@ module github.com/fgeller/kt
 require (
 	github.com/Shopify/sarama v1.26.1
 	github.com/davecgh/go-spew v1.1.1
-	github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21 // indirect
-	github.com/eapache/queue v1.1.0 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.5.1
 	golang.org/x/crypto v0.0.0-20200204104054-c9f3fb736b72
 )

produce.go

@@ -524,6 +524,12 @@ like the following:
 In case the input line cannot be interpeted as a JSON object the key and value
 both default to the input line and partition to 0.
 
+If you don't want to specify key for single message, in other words, it doesn't matter that a message goes
+to a random paritition (with equal probability), you can set the flag '-partitioner' with 'hashCodeByValue'.
+That will tell kt to take the value of a message to calculate a hashcode deciding which paritition it will go to.
+This can be helpful when you just want there are many messages distributed in partitions of a topic, and don't
+care about what the content is. 
+
 Examples:
 
 Send a single message with a specific key:
@@ -534,6 +540,11 @@ Send a single message with a specific key:
   $ kt consume -topic greetings -timeout 1s -offsets 0:3-
   {"partition":0,"offset":3,"key":"id-23","message":"ola"}
 
+Send a single message without specified key:
+  $ echo 'no key specified message' | kt produce -topic greetings -partitioner hashCodeByValue
+  Sent message to a partition decided by your case
+  
+
 Keep reading input from stdin until interrupted (via ^C).
 
   $ kt produce -topic greetings