Don't check Mix.env on startup

lib/exsync/application.ex

@@ -2,21 +2,6 @@ require Logger
 
 defmodule ExSync.Application do
   def start(_, _) do
-    case Mix.env() do
-      :dev ->
-        start_supervisor()
-
-      _ ->
-        Logger.error("ExSync NOT started. Only `:dev` environment is supported.")
-        {:ok, self()}
-    end
-  end
-
-  def start() do
-    Application.ensure_all_started(:exsync)
-  end
-
-  def start_supervisor do
     children =
       [
         maybe_include_src_monitor(),
@@ -34,6 +19,10 @@ defmodule ExSync.Application do
     Supervisor.start_link(children, opts)
   end
 
+  def start() do
+    Application.ensure_all_started(:exsync)
+  end
+
   def maybe_include_src_monitor do
     if ExSync.Config.src_monitor_enabled() do
       [ExSync.SrcMonitor]