Remove redundant files

* Removed redundant `dep` files as we now use Go moduels
* Correct import order for package_test.go

Gopkg.lock

@@ -1,27 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  name = "github.com/davecgh/go-spew"
-  packages = ["spew"]
-  revision = "346938d642f2ec3594ed81d874461961cd0faa76"
-  version = "v1.1.0"
-
-[[projects]]
-  name = "github.com/pmezard/go-difflib"
-  packages = ["difflib"]
-  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
-  version = "v1.0.0"
-
-[[projects]]
-  name = "github.com/stretchr/objx"
-  packages = ["."]
-  revision = "facf9a85c22f48d2f52f2380e4efce1768749a89"
-  version = "v0.1"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "448ddae4702c6aded2555faafd390c537789bb1c483f70b0431e6634f73f2090"
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

@@ -1,16 +0,0 @@
-[prune]
-  unused-packages = true
-  non-go = true
-  go-tests = true
-
-[[constraint]]
-  name = "github.com/davecgh/go-spew"
-  version = "~1.1.0"
-
-[[constraint]]
-  name = "github.com/pmezard/go-difflib"
-  version = "~1.0.0"
-
-[[constraint]]
-  name = "github.com/stretchr/objx"
-  version = "~0.1.0"

package_test.go

@@ -1,8 +1,9 @@
 package testify
 
 import (
-	"github.com/stretchr/testify/assert"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestImports(t *testing.T) {