introduce asynchronous data retrieval

The client now offers getTripsAsync(), getStopsAsync() and
getMessagesAsync() that return a Future of the requested objects. The
synchronous methods are still present, but only wrap the new ones
internally.

Author: stklcode

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## unreleased
+
+### Features
+* New methods for asynchronous trip, stop and message retrieval (#15)
+
 ## 2.0.0 - 2021-01-30
 ### Breaking
 * Java 11 or later required

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>de.stklcode.pubtrans</groupId>
     <artifactId>juraclient</artifactId>
-    <version>2.0.0</version>
+    <version>2.1.0-SNAPSHOT</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>5.7.0</version>
+            <version>5.7.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>