Upgrade jackson and slf4j

Author: io7m

pom.xml

@@ -104,7 +104,7 @@
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-core</artifactId>
-        <version>2.9.4</version>
+        <version>2.9.7</version>
       </dependency>
       <dependency>
         <groupId>ch.qos.logback</groupId>
@@ -114,7 +114,7 @@
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
-        <version>1.8.0-beta1</version>
+        <version>1.8.0-beta2</version>
       </dependency>
       <dependency>
         <groupId>com.io7m.jaffirm</groupId>