CI codecov reports (#232)

* Add jacoco plugin to generate test reports

* Update travis yml to run test reports and upload to codecov.io

* fix indentation

* Add codecov badge to readme

Author: daniellevass

.travis.yml

@@ -6,4 +6,8 @@ jdk:
   - openjdk10
   - openjdk11
 script:
-  - ./gradlew test
+  - ./gradlew jacocoTestReport test
+
+after_success:
+# report coverage
+- bash <(curl -s https://codecov.io/bash)

README.md

@@ -1,6 +1,7 @@
 # Pusher Channels Java Client
 
 [![Build Status](https://travis-ci.org/pusher/pusher-websocket-java.svg?branch=master)](https://travis-ci.org/pusher/pusher-websocket-java)
+[![codecov](https://codecov.io/gh/pusher/pusher-websocket-java/branch/master/graph/badge.svg)](https://codecov.io/gh/pusher/pusher-websocket-java)
 
 Pusher Channels client library for Java targeting **Android** and general Java.
 

build.gradle

@@ -19,6 +19,7 @@ apply plugin: 'maven'
 apply plugin: 'eclipse'
 apply plugin: 'org.ajoberstar.github-pages'
 apply plugin: 'signing'
+apply plugin: 'jacoco'
 
 group = "com.pusher"
 version = "2.0.2"
@@ -186,3 +187,13 @@ task createPublishTarget {
 wrapper {
 	gradleVersion = '5.5.1'
 }
+
+jacoco {
+	toolVersion = "0.8.4"
+}
+
+jacocoTestReport {
+	reports.xml.enabled = true
+	reports.html.enabled = false
+	reports.csv.enabled = false
+}