Makefile: Add support for "make elvis" when using rebar3

Makefile.in

@@ -642,6 +642,13 @@ dialyzer: erlang_plt deps_plt ejabberd_plt
 endif
 endif
 
+#.
+#' elvis
+#
+
+elvis:
+	$(REBAR) lint
+
 #.
 #' test
 #
@@ -699,6 +706,7 @@ help:
 	@echo "  indent         Indent source code using erlang-mode [emacs]"
 	@echo ""
 	@echo "  dialyzer       Run Dialyzer static analyzer"
+	@echo "  elvis          Run Elvis source code style reviewer [rebar3]"
 	@echo "  hooks          Run hooks validator"
 	@echo "  test           Run Common Tests suite [rebar3]"
 	@echo "  test-eunit     Run EUnit suite [rebar3]"

rebar.config

@@ -156,7 +156,8 @@
                                                {branch, "consolidation_fix"}}}
                        }]}}.
 {if_rebar3, {project_plugins, [configure_deps,
-                               {if_var_true, tools, rebar3_format}
+                               {if_var_true, tools, rebar3_format},
+                               {if_var_true, tools, rebar3_lint}
                               ]}}.
 {if_not_rebar3, {plugins, [
                            deps_erl_opts, override_deps_versions2, override_opts, configure_deps