update release note for Application Insights lib

Author: Eskibear

PluginsAndFeatures/azure-toolkit-for-intellij/resources/META-INF/plugin.xml

@@ -22,6 +22,7 @@
       <h3>[3.10.0]</h3>
       <ul>
         <li>Supported to fix Spark job configuration in run configuration before Spark job submission.</li>
+        <li>Updated Application Insights library to v2.1.2.</li>
         <li>Fixed some bugs.</li>
       <ul>
       <h3>[3.9.0]</h3>