Bump freemarker from 2.3.30 to 2.3.31

Bumps freemarker from 2.3.30 to 2.3.31.

Change-Id: I27c84520a5b22df87c9ac77b1b959b5671ce3a2e

---
updated-dependencies:
- dependency-name: org.freemarker:freemarker
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #16

Change-Id: I79357f00bf519406481d248f013c1b8ede03f442
diff --git a/pom.xml b/pom.xml
index 85dc451..6c34d9f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -95,7 +95,7 @@
     <dependency>
       <groupId>org.freemarker</groupId>
       <artifactId>freemarker</artifactId>
-      <version>2.3.30</version>
+      <version>2.3.31</version>
     </dependency>
 
     <!-- https://mvnrepository.com/artifact/org.codehaus.mojo/cobertura-maven-plugin -->