Bump v1.0.1-dev

Author: ericmj

mix.exs

@@ -1,7 +1,7 @@
 defmodule Hex.MixProject do
   use Mix.Project
 
-  @version "1.0.0"
+  @version "1.0.1-dev"
 
   {:ok, system_version} = Version.parse(System.version())
   @elixir_version {system_version.major, system_version.minor, system_version.patch}