Bump httpclient from 4.5.12 to 4.5.13 in /NotificationHubs (#78)

Bumps httpclient from 4.5.12 to 4.5.13.

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Author: dependabot[bot]

NotificationHubs/pom.xml

@@ -139,7 +139,7 @@
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.5.12</version>
+			<version>4.5.13</version>
 			<exclusions>
 				<exclusion>
 					<groupId>commons-codec</groupId>