added required dependencies for Java 11 (#125)

pom.xml

@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.github.salesforce-marketingcloud</groupId>
   <artifactId>fuelsdk</artifactId>
-  <version>1.5.0</version>
+  <version>1.5.1</version>
   <name>Salesforce Marketing Cloud Java SDK</name>
   <description>Salesforce Marketing Cloud Java SDK</description>
   <url>https://github.com/salesforce-marketingcloud/FuelSDK-Java</url>
@@ -28,6 +28,8 @@
     <url>git@github.com:salesforce-marketingcloud/FuelSDK-Java</url>
   </scm>
   <properties>
+    <maven.compiler.source>1.6</maven.compiler.source>
+    <maven.compiler.target>1.6</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <beanutils.version>1.9.2</beanutils.version>
     <cxf.version>3.1.2</cxf.version>
@@ -36,6 +38,10 @@
     <junit.version>4.12</junit.version>
     <lang.version>2.6</lang.version>
     <log4j.version>1.2.17</log4j.version>
+    <javax.jaxb.version>2.3.0</javax.jaxb.version>
+    <com.sun.jaxb.version>2.3.0</com.sun.jaxb.version>
+    <com.sun.saaj.version>1.5.0</com.sun.saaj.version>
+    <javax.jaxws.version>2.2.6</javax.jaxws.version>
   </properties>
   <dependencies>
     <dependency>
@@ -47,6 +53,16 @@
       <groupId>org.apache.cxf</groupId>
       <artifactId>cxf-rt-frontend-jaxws</artifactId>
       <version>${cxf.version}</version>
+      <exclusions>
+        <exclusion>
+          <groupId>com.sun.xml.bind</groupId>
+          <artifactId>jaxb-impl</artifactId>
+        </exclusion>
+        <exclusion>
+          <groupId>com.sun.xml.bind</groupId>
+          <artifactId>jaxb-core</artifactId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>org.apache.cxf</groupId>
@@ -63,6 +79,37 @@
       <artifactId>cxf-xjc-runtime</artifactId>
       <version>${cxf-xjc.version}</version>
     </dependency>
+    <dependency>
+      <groupId>javax.xml.bind</groupId>
+      <artifactId>jaxb-api</artifactId>
+      <version>${javax.jaxb.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.xml.bind</groupId>
+      <artifactId>jaxb-core</artifactId>
+      <version>${com.sun.jaxb.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.xml.bind</groupId>
+      <artifactId>jaxb-impl</artifactId>
+      <version>${com.sun.jaxb.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.xml.messaging.saaj</groupId>
+      <artifactId>saaj-impl</artifactId>
+      <version>${com.sun.saaj.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>javax.xml.ws</groupId>
+      <artifactId>jaxws-api</artifactId>
+      <version>${javax.jaxws.version}</version>
+    </dependency>
+    <dependency>
+      <groupId>com.sun.xml.ws</groupId>
+      <artifactId>jaxws-ri</artifactId>
+      <version>2.3.3</version>
+      <type>pom</type>
+    </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
@@ -227,6 +274,31 @@
             <artifactId>cxf-xjc-ts</artifactId>
             <version>${cxf-xjc.version}</version>
           </dependency>
+          <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>${javax.jaxb.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>com.sun.xml.bind</groupId>
+            <artifactId>jaxb-core</artifactId>
+            <version>${com.sun.jaxb.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>com.sun.xml.bind</groupId>
+            <artifactId>jaxb-impl</artifactId>
+            <version>${com.sun.jaxb.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>com.sun.xml.messaging.saaj</groupId>
+            <artifactId>saaj-impl</artifactId>
+            <version>${com.sun.saaj.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>javax.xml.ws</groupId>
+            <artifactId>jaxws-api</artifactId>
+            <version>${javax.jaxws.version}</version>
+          </dependency>
         </dependencies>
       </plugin>
       <plugin>