updated inflector to work with java 11

Author: HugoMario

modules/swagger-codegen/src/main/resources/JavaInflector/pom.mustache

@@ -137,6 +137,10 @@
         </repository>
     </repositories>
     <properties>
+        {{#java11}}
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+        {{/java11}}
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven-plugin-version>1.0.0</maven-plugin-version>
         <swagger-inflector-version>1.0.14</swagger-inflector-version>