simplify interf defs in pref of more complex impl

go.mod

@@ -6,9 +6,8 @@ require (
 	github.com/ethereum/go-ethereum v1.9.5
 	github.com/onsi/ginkgo v1.11.0
 	github.com/onsi/gomega v1.8.1
-	github.com/renproject/abi v0.4.1
-	github.com/renproject/id v0.2.2
-	github.com/renproject/phi v0.1.0
-	github.com/renproject/surge v1.1.2
+	github.com/renproject/abi v0.4.1 // indirect
+	github.com/renproject/id v0.3.3
+	github.com/renproject/surge v1.1.3
 	github.com/sirupsen/logrus v1.4.2
 )

go.sum

@@ -121,12 +121,18 @@ github.com/renproject/id v0.2.1 h1:bNQStliAf/QUS8LH4bSN+GFoSDuguFCD5nzE9jlAqqM=
 github.com/renproject/id v0.2.1/go.mod h1:a3IoJpN44tsb2PD4QEFiu6wZy+UuanOkMtGcnxdLikk=
 github.com/renproject/id v0.2.2 h1:hQH74EK5GjzG588EVJ7m5nnXfJd36mmq/ipkYcL8vAc=
 github.com/renproject/id v0.2.2/go.mod h1:xEoepH7Jze4l+gJxzSh9yRt634XyiM1j9si+WS2Emsc=
+github.com/renproject/id v0.3.1 h1:92CbN8sQTlMIXid69fOJXEkES67uJDORkobRvqoVvJs=
+github.com/renproject/id v0.3.1/go.mod h1:xEoepH7Jze4l+gJxzSh9yRt634XyiM1j9si+WS2Emsc=
+github.com/renproject/id v0.3.3 h1:IiJR1mJ8PvAds+zRz1gxukbWKJJrYQSUnNdihOsaGAY=
+github.com/renproject/id v0.3.3/go.mod h1:BmNHJVfkLsDcvQFHAAPxhhv2KUvWhT4xXFo1Phmp8Kw=
 github.com/renproject/phi v0.1.0 h1:ZOn7QeDribk/uV46OhQWcTLxyuLg7P+xR1Hfl5cOQuI=
 github.com/renproject/phi v0.1.0/go.mod h1:Hrxx2ONVpfByficRjyRd1trecalYr0lo7Z0akx8UXqg=
 github.com/renproject/surge v1.1.1 h1:dpgMRBR1raPWw8TUmICjAVsyl88EmPnUq+o4CZqAm9g=
 github.com/renproject/surge v1.1.1/go.mod h1:UnnFYpLSD0T9MzCcyHjbNdmxiQsDVyBDCuqcbhcaLCY=
 github.com/renproject/surge v1.1.2 h1:Yy3pTlRyaMJGLfn64JHgCnWs3cWbRJjE+aFxZXRGfWU=
 github.com/renproject/surge v1.1.2/go.mod h1:UnnFYpLSD0T9MzCcyHjbNdmxiQsDVyBDCuqcbhcaLCY=
+github.com/renproject/surge v1.1.3 h1:nCN3yWUbIbSDWyMaU6aCIidCE15yEcZb8Bcuziog/wU=
+github.com/renproject/surge v1.1.3/go.mod h1:UnnFYpLSD0T9MzCcyHjbNdmxiQsDVyBDCuqcbhcaLCY=
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
@@ -156,6 +162,8 @@ golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20200115085410-6d4e4cb37c7d h1:2+ZP7EfsZV7Vvmx3TIqSlSzATMkTAKqM14YGFPoSKjI=
 golang.org/x/crypto v0.0.0-20200115085410-6d4e4cb37c7d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 h1:3zb4D3T4G8jdExgVU/95+vQXfpEPiMdCaZgmGVxjNHM=
+golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79 h1:IaQbIIB2X/Mp/DKctl6ROxz1KyMlKp4uyvL6+kQ7C88=
+golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=