upgrade to snakeyaml to 1.26

Author: stevehu

pom.xml

@@ -62,7 +62,7 @@
         <java.version>1.6</java.version>
         <java.testversion>1.8</java.testversion>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <version.jackson>2.10.5.1</version.jackson>
+        <version.jackson>2.12.1</version.jackson>
         <version.slf4j>1.7.30</version.slf4j>
         <version.common-lang3>3.7</version.common-lang3>
         <version.joni>2.1.31</version.joni>