Update to parent pom version 36

Needed to add some OSGi dependencies that came in automatically with the
previously used parent pom.
diff --git a/pom.xml b/pom.xml
index 34f725b..07a38b3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>31</version>
+        <version>36</version>
         <relativePath />
     </parent>
 
@@ -121,6 +121,26 @@
         <dependency>
             <groupId>org.osgi</groupId>
             <artifactId>osgi.core</artifactId>
+            <version>6.0.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>osgi.annotation</artifactId>
+            <version>6.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.service.component.annotations</artifactId>
+            <version>1.3.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.osgi</groupId>
+            <artifactId>org.osgi.service.metatype.annotations</artifactId>
+            <version>1.3.0</version>
+            <scope>provided</scope>
         </dependency>
         <dependency>
             <groupId>org.osgi</groupId>