Switch to rebar3

Makefile

@@ -1,32 +1,24 @@
 APPLICATION := getopt
 
-REBAR=$(shell which rebar || echo ./rebar)
-ERL := erl
-EPATH := -pa ebin
-
-DIALYZER=dialyzer
-DIALYZER_OPTS=-Wno_return -Wrace_conditions -Wunderspecs -Wno_undefined_callbacks --fullpath
-
-.PHONY: all clean compile console dialyze doc test
+.PHONY: all clean compile dialyzer edoc shell test
 
 all: compile
 
 clean:
-	@$(REBAR) clean
+	@rebar3 clean
 
 compile:
-	@$(REBAR) compile
+	@rebar3 compile
 
-console:
-	$(ERL) -sname $(APPLICATION) $(EPATH)
+dialyzer: compile
+	@rebar3 dialyzer
 
-dialyze: compile
-	@$(DIALYZER) $(DIALYZER_OPTS) -r ./
+edoc:
+	@rebar3 edoc
 
-doc:
-	@$(REBAR) doc
+shell:
+	@rebar3 shell
 
 test:
-	@erl -make
-	@$(ERL) -sname $(APPLICATION) $(EPATH) -noinput -s getopt_test test -s init stop
+	@rebar3 eunit