Updated dependencies

Author: rijnb

pom.xml

@@ -8,7 +8,7 @@
     <artifactId>mapcode</artifactId>
 
     <packaging>jar</packaging>
-    <version>2.4.5</version>
+    <version>2.4.6-SNAPSHOT</version>
 
     <name>Mapcode Java Library</name>
     <description>
@@ -74,17 +74,17 @@
         <!-- Modules. -->
         <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
         <jacoco-maven-plugin.version>0.7.9</jacoco-maven-plugin.version>
-        <maven-compiler-plugin.version>3.6.1</maven-compiler-plugin.version>
+        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
         <maven-javadoc-plugin.version>2.10.4</maven-javadoc-plugin.version>
         <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
         <maven-project-info-reports-plugin.version>2.9</maven-project-info-reports-plugin.version>
         <maven-site-plugin.version>3.6</maven-site-plugin.version>
         <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
-        <maven-surefire-plugin.version>2.20</maven-surefire-plugin.version>
+        <maven-surefire-plugin.version>2.20.1</maven-surefire-plugin.version>
         <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
 
         <!-- libraries. -->
-        <gson.version>2.8.1</gson.version>
+        <gson.version>2.8.2</gson.version>
         <jsr305.version>3.0.2</jsr305.version>
         <junit.version>4.12</junit.version>
         <log4j.version>1.2.17</log4j.version>