Fix Elixir warnings (#62)

config/config.exs

 use Mix.Config
 
-if :test == Mix.env do
+if :test == Mix.env() do
   config :logger, backends: []
 end

lib/file_system/backends/fs_mac.ex

@@ -174,7 +174,7 @@ defmodule FileSystem.Backends.FSMac do
 
   def parse_line(line) do
     [_, _, events, path] = line |> to_string |> String.split(["\t", "="], parts: 4)
-    {path, events |> String.split(~w|[ , ]|, trim: true) |> Enum.map(&String.to_existing_atom/1)}
+    {path, events |> String.split(["[", ",", "]"], trim: true) |> Enum.map(&String.to_existing_atom/1)}
   end
 
 end

mix.exs

@@ -9,7 +9,7 @@ defmodule FileSystem.Mixfile do
       description: "A file system change watcher wrapper based on [fs](https://github.com/synrc/fs)",
       source_url: "https://github.com/falood/file_system",
       package: package(),
-      compilers: [:file_system | Mix.compilers],
+      compilers: [:file_system | Mix.compilers()],
       aliases: ["compile.file_system": &file_system/1],
       docs: [
         extras: ["README.md"],
@@ -31,7 +31,7 @@ defmodule FileSystem.Mixfile do
   end
 
   defp file_system(_args) do
-    case :os.type do
+    case :os.type() do
       {:unix, :darwin} -> compile_mac()
       _ -> :ok
     end
@@ -45,7 +45,7 @@ defmodule FileSystem.Mixfile do
     if Mix.Utils.stale?(Path.wildcard(source), [target]) do
       Logger.info "Compiling file system watcher for Mac..."
       cmd = "clang -framework CoreFoundation -framework CoreServices -Wno-deprecated-declarations #{source} -o #{target}"
-      if Mix.shell.cmd(cmd) > 0 do
+      if Mix.shell().cmd(cmd) > 0 do
         Logger.error "Could not compile file system watcher for Mac, try to run #{inspect cmd} manually inside the dependency."
       else
         Logger.info "Done."

test/file_system_test.exs

@@ -22,7 +22,7 @@ defmodule FileSystemTest do
     File.touch("#{tmp_dir}/b")
     assert_receive {:file_event, ^pid, {_path, _events}}, 5000
 
-    Port.list
+    Port.list()
     |> Enum.reject(fn port ->
       :undefined == port |> Port.info |> Access.get(:os_pid)
     end)