change function arn to lower case, set resource.name (#32)

Author: agocs

build.gradle

@@ -46,7 +46,7 @@ sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
 group = 'com.datadoghq'
-version= '0.2.0'
+version= '0.2.1'
 
 allprojects {
     repositories {

src/main/java/com/datadoghq/datadog_lambda_java/DDLambda.java

@@ -190,11 +190,12 @@ private SpanBuilder addDDTags(SpanBuilder spanBuilder, Context cxt) {
         if (spanBuilder != null) {
             spanBuilder.withTag("request_id", requestId);
             spanBuilder.withTag("service", "aws.lambda");
-            spanBuilder.withTag("function_arn", functionArn);
+            spanBuilder.withTag("function_arn", functionArn.toLowerCase());
             spanBuilder.withTag("cold_start", ColdStart.getColdStart(cxt));
             spanBuilder.withTag("datadog_lambda", BuildConfig.datadog_lambda_version);
             spanBuilder.withTag("resource_names", functionName);
             spanBuilder.withTag("function_version", functionVersion);
+            spanBuilder.withTag("resource.name", functionName);
         }
         return spanBuilder;
     }