Release 2.1

Pin direct dependencies for reproducibility

pom.xml

@@ -4,14 +4,15 @@
 
 	<groupId>hu.ppke.itk.nlpg</groupId>
 	<artifactId>purepos</artifactId>
-	<version>2.1-dev</version>
+	<version>2.1</version>
 	<packaging>jar</packaging>
 
 	<name>purepos</name>
 	<url>http://nlpg.itk.ppke.hu/purepos</url>
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.build.outputTimestamp>2018-10-05T16:14:00Z</project.build.outputTimestamp>
 	</properties>
 
 	<build>
@@ -28,6 +29,7 @@
 	<plugin>
 		<groupId>org.apache.maven.plugins</groupId>
 		<artifactId>maven-jar-plugin</artifactId>
+		<version>3.2.0</version>
 		<configuration>
 			<archive>
 				<manifest>
@@ -38,6 +40,7 @@
 	</plugin>
 	<plugin>
 		<artifactId>maven-assembly-plugin</artifactId>
+		<version>3.2.0</version>
 		<configuration>
 			<archive>
 				<manifest>