adding debug info to the prod release profile (#191)

Author: jeffgrunewald

rebar.config

@@ -139,6 +139,7 @@
             {release, {blockchain_node, semver}, [blockchain_node]},
             {sys_config, "./config/prod.config"},
             {dev_mode, false},
+            {debug_info, keep},
             {include_src, false},
             {include_erts, true}
         ]}