Bump logback-classic from 1.1.2 to 1.2.0 (#159)

Bumps logback-classic from 1.1.2 to 1.2.0.

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

Signed-off-by: dbernstein

pom.xml

@@ -28,7 +28,7 @@
     <jena.version>3.1.1</jena.version>
     <jena.patch.version>4.7.2</jena.patch.version>
     <junit.version>4.13.1</junit.version>
-    <logback.version>1.1.2</logback.version>
+    <logback.version>1.2.0</logback.version>
     <mockito.version>1.10.8</mockito.version>
     <shade.plugin.version>2.4.3</shade.plugin.version>
     <slf4j.version>1.7.10</slf4j.version>