MOD: update readme

ADD: dep for package management

Gopkg.toml

@@ -0,0 +1,38 @@
+
+# Gopkg.toml example
+#
+# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
+# for detailed Gopkg.toml documentation.
+#
+# required = ["github.com/user/thing/cmd/thing"]
+# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
+#
+# [[constraint]]
+#   name = "github.com/user/project"
+#   version = "1.0.0"
+#
+# [[constraint]]
+#   name = "github.com/user/project2"
+#   branch = "dev"
+#   source = "github.com/myfork/project2"
+#
+# [[override]]
+#  name = "github.com/x/y"
+#  version = "2.4.0"
+
+
+[[constraint]]
+  name = "github.com/BurntSushi/toml"
+  version = "0.3.0"
+
+[[constraint]]
+  name = "github.com/Sirupsen/logrus"
+  version = "1.0.3"
+
+[[constraint]]
+  branch = "master"
+  name = "github.com/miekg/dns"
+
+[[constraint]]
+  name = "github.com/stretchr/testify"
+  version = "1.1.4"

README.md

@@ -14,5 +14,8 @@
 * DNSSEC
 * Cache
 
+# Package Management
+Apex uses the Go community [dep](https://github.com/golang/dep) project for package management, but it's young so maybe will cause some unexcepted issue occurred during building. For more information about dep project status, check [dep - Current status](https://github.com/golang/dep#current-status)
+
 # License
 MIT