[package.xml] Change from _ to - in the name

package.xml is able to handle names with minus.

Author: olivier-stasse

package.xml

@@ -1,5 +1,5 @@
 <package format="2">
-  <name>sot_dynamic_pinocchio</name>
+  <name>sot-dynamic-pinocchio</name>
   <version>3.3.1</version>
   <description>
     Pinocchio bindings for dynamic-graph
@@ -18,15 +18,15 @@
   <build_depend version_gte="1.1" version_lt="2.0">genmsg</build_depend>
 
 
-  <build_depend>sot_core</build_depend>
+  <build_depend>sot-core</build_depend>
   <build_depend>pinocchio</build_depend>
 
-  <build_depend>sot_core</build_depend>
+  <build_depend>sot-core</build_depend>
   <build_depend>pinocchio</build_depend>
 
   <build_export_depend>pinocchio</build_export_depend>
 
-  <exec_depend>sot_core</exec_depend>
+  <exec_depend>sot-core</exec_depend>
   <exec_depend>pinocchio</exec_depend>
 
   <test_depend>gtest</test_depend>