Upgrade maven plugin versions

Closes gh-94

Author: philwebb

pom.xml

@@ -92,12 +92,12 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-clean-plugin</artifactId>
-					<version>3.0.0</version>
+					<version>3.1.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-compiler-plugin</artifactId>
-					<version>3.6.1</version>
+					<version>3.8.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
@@ -107,17 +107,12 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-dependency-plugin</artifactId>
-					<version>3.0.1</version>
-				</plugin>
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-eclipse-plugin</artifactId>
-					<version>2.10</version>
+					<version>3.1.1</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-failsafe-plugin</artifactId>
-					<version>2.20</version>
+					<version>2.22.1</version>
 					<executions>
 						<execution>
 							<goals>
@@ -135,32 +130,32 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-invoker-plugin</artifactId>
-					<version>3.0.0</version>
+					<version>3.2.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-jar-plugin</artifactId>
-					<version>3.0.2</version>
+					<version>3.1.1</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-plugin-plugin</artifactId>
-					<version>3.5</version>
+					<version>3.6.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-shade-plugin</artifactId>
-					<version>3.0.0</version>
+					<version>3.2.1</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-site-plugin</artifactId>
-					<version>3.6</version>
+					<version>3.7.1</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-surefire-plugin</artifactId>
-					<version>2.20</version>
+					<version>2.22.1</version>
 					<configuration>
 						<includes>
 							<include>**/*Tests.java</include>
@@ -179,17 +174,17 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-javadoc-plugin</artifactId>
-					<version>3.0.0</version>
+					<version>3.1.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-resources-plugin</artifactId>
-					<version>3.0.2</version>
+					<version>3.1.0</version>
 				</plugin>
 				<plugin>
 					<groupId>org.codehaus.mojo</groupId>
 					<artifactId>versions-maven-plugin</artifactId>
-					<version>2.3</version>
+					<version>2.7</version>
 				</plugin>
 				<plugin>
 					<groupId>org.codehaus.mojo</groupId>