deps: update iam.version to v0.15.0 (#118)

Author: renovate-bot

Diff for: pom.xml

@@ -69,7 +69,7 @@
     <threeten.version>1.4.4</threeten.version>
     <javax.annotations.version>1.3.2</javax.annotations.version>
     <animal-sniffer.version>1.19</animal-sniffer.version>
-    <iam.version>0.13.0</iam.version>
+    <iam.version>0.15.0</iam.version>
     <opencensus.version>0.24.0</opencensus.version>
     <findbugs.version>3.0.2</findbugs.version>
   </properties>