Chore: bump github.com/stretchr/testify from 1.6.1 to 1.7.0 (#607)

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](https://github.com/stretchr/testify/compare/v1.6.1...v1.7.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/miekg/dns v1.1.35
 	github.com/pires/go-proxyproto v0.4.0
 	github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c
-	github.com/stretchr/testify v1.6.1
+	github.com/stretchr/testify v1.7.0
 	github.com/v2fly/VSign v0.0.0-20201108000810-e2adc24bf848
 	go.starlark.net v0.0.0-20201210151846-e81fc95f7bd5
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad

go.sum

@@ -169,6 +169,8 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
+github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=
 github.com/v2fly/VSign v0.0.0-20201108000810-e2adc24bf848 h1:p1UzXK6VAutXFFQMnre66h7g1BjRKUnLv0HfmmRoz7w=
 github.com/v2fly/VSign v0.0.0-20201108000810-e2adc24bf848/go.mod h1:p80Bv154ZtrGpXMN15slDCqc9UGmfBuUzheDFBYaW/M=