Update dependencies and add log

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

pom.xml

@@ -41,18 +41,18 @@
 
     <properties>
         <!-- Compile libs -->
-        <fastjson.version>1.2.47</fastjson.version>
+        <fastjson.version>1.2.49</fastjson.version>
 
         <!-- Test libs -->
         <junit.version>4.12</junit.version>
-        <mockito.version>2.18.0</mockito.version>
+        <mockito.version>2.21.0</mockito.version>
 
         <!-- Build -->
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.source.version>1.6</java.source.version>
         <java.target.version>1.6</java.target.version>
         <java.encoding>UTF-8</java.encoding>
-        <maven.compiler.version>3.7.0</maven.compiler.version>
+        <maven.compiler.version>3.8.0</maven.compiler.version>
         <maven.source.version>3.0.1</maven.source.version>
         <maven.javadoc.version>3.0.1</maven.javadoc.version>
         <maven.gpg.version>1.6</maven.gpg.version>

sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/flow/FlowRuleManager.java

@@ -73,6 +73,7 @@ public class FlowRuleManager {
      */
     public static void register2Property(SentinelProperty<List<FlowRule>> property) {
         synchronized (listener) {
+            RecordLog.info("[FlowRuleManager] Registering new property to flow rule manager");
             currentProperty.removeListener(listener);
             property.addListener(listener);
             currentProperty = property;