Upgrade spotbugs-maven-plugin to 3.1.0

Change-Id: I1817afd3f75bd1f030f1b5c6bc683afa51dc5a6b
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

pom.xml

@@ -213,7 +213,7 @@
     <maven-javadoc-plugin-version>3.0.0</maven-javadoc-plugin-version>
     <tycho-extras-version>1.0.0</tycho-extras-version>
     <gson-version>2.2.4</gson-version>
-    <spotbugs-maven-plugin-version>3.1.0-RC8</spotbugs-maven-plugin-version>
+    <spotbugs-maven-plugin-version>3.1.0</spotbugs-maven-plugin-version>
     <maven-surefire-report-plugin-version>2.20.1</maven-surefire-report-plugin-version>
 
     <!-- Properties to enable jacoco code coverage analysis -->