upgrade to PDFBox 2.0.15

Author: jazzido

pom.xml

@@ -237,7 +237,7 @@
     <dependency>
         <groupId>org.apache.pdfbox</groupId>
         <artifactId>pdfbox</artifactId>
-        <version>2.0.12</version>
+        <version>2.0.15</version>
     </dependency>
 
     <dependency>