Bump junit to 4.13.2 and plugins to latest (#20)

Author: dampcake

pom.xml

@@ -61,7 +61,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
@@ -85,7 +85,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
+            <version>3.2.7</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>
@@ -113,7 +113,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.8.1</version>
+        <version>3.14.0</version>
         <configuration>
           <source>1.8</source>
           <target>1.8</target>
@@ -122,7 +122,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-source-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>3.3.1</version>
         <executions>
           <execution>
             <id>attach-sources</id>
@@ -135,7 +135,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.1.1</version>
+        <version>3.11.2</version>
         <configuration>
           <show>public</show>
           <nohelp>true</nohelp>
@@ -156,7 +156,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.8.6</version>
+        <version>0.8.12</version>
         <executions>
           <execution>
 						<goals>
@@ -176,14 +176,14 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-release-plugin</artifactId>
-        <version>2.5.3</version>
+        <version>3.1.0</version>
       </plugin>
 
       <!-- Publish Javadoc using: 'mvn clean javadoc:javadoc scm-publish:publish-scm' -->
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-scm-publish-plugin</artifactId>
-        <version>3.0.0</version>
+        <version>3.3.0</version>
         <configuration>
           <checkoutDirectory>${project.build.directory}/scmpublish</checkoutDirectory>
           <checkinComment>Publishing javadoc for ${project.artifactId}:${project.version}</checkinComment>