Add exceptions to fix xref on travis
On travis, though not locally, these functions are causing `make xref`
to fail.
It might be possible to revert this commit on a different CI.
diff --git a/rebar.config b/rebar.config
index eda5a2c..ae022e6 100644
--- a/rebar.config
+++ b/rebar.config
@@ -31,6 +31,8 @@
- (\"diameter_dict_util\":\"format_error\"/\"1\")
- (\"diameter_dict_util\":\"parse\"/\"2\")
- (\"erlang\":\"timestamp\"/\"0\")
+ - (\"rebar_shell\":\"shell\"/\"2\")
+ - (\"error_logger\":\"swap_handler\"/\"1\")
- (\"rebar_rnd\":\"seed\"/\"1\")
- (\"rebar_rnd\":\"uniform\"/\"0\"))",
[]}]}.
