Merge pull request #3 from bobocode-projects/ticket/11

#11 upgrade exercises repository to Java 11

Author: tboychuk

pom.xml

@@ -19,8 +19,8 @@
     <packaging>pom</packaging>
 
     <properties>
-        <maven.compiler.source>1.10</maven.compiler.source>
-        <maven.compiler.target>1.10</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
     </properties>
 
     <dependencies>