Bump ch.qos.logback:logback-core from 1.0.9 to 1.3.15

Bumps [ch.qos.logback:logback-core](https://github.com/qos-ch/logback) from 1.0.9 to 1.3.15.
- [Commits](qos-ch/logback@v_1.0.9...v_1.3.15)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -103,7 +103,7 @@ the License.
     <jline.version>2.12</jline.version>
     <junit.version>4.11</junit.version>
     <mockito.version>1.9.5</mockito.version>
-    <logback.version>1.0.9</logback.version>
+    <logback.version>1.3.15</logback.version>
     <servlet.api.version>3.0.1</servlet.api.version>
     <slf4j.version>1.7.5</slf4j.version>
     <netty.version>4.1.75.Final</netty.version>