[build] push mvn extension for polyglot ruby

expected to resolve GH-195

Author: kares

.mvn/extensions.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<extensions>
+  <extension>
+    <groupId>org.torquebox.mojo</groupId>
+    <artifactId>mavengem-wagon</artifactId>
+    <version>1.0.3</version>
+  </extension>
+  <extension>
+    <groupId>io.takari.polyglot</groupId>
+    <artifactId>polyglot-ruby</artifactId>
+    <version>0.4.4</version>
+  </extension>
+</extensions>