Fix #81 by updating SnakeYAML dep to 1.23

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -8,6 +8,11 @@ Modules:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.9.7 (not yet released)
+
+#81: Jackson 2.9.5, 2.9.6 incompatible with snakeyaml 1.20, 1.21
+ (reported by Yegor B)
+
 2.9.6 (12-Jun-2018)
 
 #84 (yaml): Add option to allow use of platform-linefeed

yaml/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>org.yaml</groupId>
       <artifactId>snakeyaml</artifactId>
-      <version>1.18</version>
+      <version>1.23</version>
     </dependency>
 
      <!-- and for testing need annotations -->