Add support for kafka 2.4.0

.travis.yml

@@ -1,7 +1,6 @@
 dist: xenial
 language: go
 go:
-- 1.11.x
 - 1.12.x
 - 1.13.x
 

README.md

@@ -20,7 +20,7 @@ You might also want to look at the [Frequently Asked Questions](https://github.c
 Sarama provides a "2 releases + 2 months" compatibility guarantee: we support
 the two latest stable releases of Kafka and Go, and we provide a two month
 grace period for older releases. This means we currently officially support
-Go 1.11 through 1.13, and Kafka 2.1 through 2.3, although older releases are
+Go 1.12 through 1.13, and Kafka 2.1 through 2.4, although older releases are
 still likely to work.
 
 Sarama follows semantic versioning and provides API stability via the gopkg.in service.

dev.yml

@@ -2,7 +2,7 @@ name: sarama
 
 up:
   - go:
-      version: '1.13.1'
+      version: '1.13.4'
 
 commands:
   test:

utils.go

@@ -161,6 +161,7 @@ var (
 	V2_1_0_0  = newKafkaVersion(2, 1, 0, 0)
 	V2_2_0_0  = newKafkaVersion(2, 2, 0, 0)
 	V2_3_0_0  = newKafkaVersion(2, 3, 0, 0)
+	V2_4_0_0  = newKafkaVersion(2, 4, 0, 0)
 
 	SupportedVersions = []KafkaVersion{
 		V0_8_2_0,
@@ -185,9 +186,10 @@ var (
 		V2_1_0_0,
 		V2_2_0_0,
 		V2_3_0_0,
+		V2_4_0_0,
 	}
 	MinVersion = V0_8_2_0
-	MaxVersion = V2_3_0_0
+	MaxVersion = V2_4_0_0
 )
 
 //ParseKafkaVersion parses and returns kafka version or error from a string