update freemarker to 2.3.31 (#168)

Maxim Thomas

29.51.2021 c84f774dc06155b14a8c6497bd7afadfb227b53b

 pom.xml

@@ -34,7 +34,7 @@
        <product.locales>ca_ES,es,de,fr,ja,ko,pl,zh_CN,zh_TW</product.locales>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <localized.jars.classifier>i18n</localized.jars.classifier>
        <freemarker.version>2.3.28</freemarker.version>
        <freemarker.version>2.3.31</freemarker.version>
        <grizzly-framework.version>2.4.4</grizzly-framework.version>
        <metrics-core.version>3.1.2</metrics-core.version>
        <maven.compiler.target>1.8</maven.compiler.target>