Bump httpmime from 4.5.12 to 4.5.13 in /NotificationHubs (#77)

Bumps httpmime from 4.5.12 to 4.5.13.

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NotificationHubs/pom.xml

@@ -134,7 +134,7 @@
 		<dependency>
     		<groupId>org.apache.httpcomponents</groupId>
     		<artifactId>httpmime</artifactId>
-    		<version>4.5.12</version>
+    		<version>4.5.13</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>