Remove the Makefile that runs cargo test which is incompatible with ecargo.
--- a/Makefile	2018-10-21 05:24:00.000000000 +0800
+++ b/Makefile	1970-01-01 08:00:00.000000000 +0800
@@ -1,15 +0,0 @@
-all: test
-.PHONY: all
-
-test: 
-	@echo TEST DEFAULT FEATURES
-	@cargo test --all
-	@echo TEST WITH BACKTRACE
-	@cargo test --features backtrace --all
-	@echo TEST NO DEFAULT FEATURES
-	@cargo check --no-default-features --all
-.PHONY: test
-
-check:
-	@cargo check --all
-.PHONY: check