Bump logback-classic from 1.2.5 to 1.2.6 (#55)

Bumps logback-classic from 1.2.5 to 1.2.6.

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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pom.xml

@@ -79,7 +79,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.2.5</version>
+            <version>1.2.6</version>
             <scope>test</scope>
         </dependency>
         <dependency>