add ecto as formatter dep

Author: fahchen

.formatter.exs

@@ -1,4 +1,5 @@
 # Used by "mix format"
 [
-  inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}"]
+  inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}"],
+  import_deps: [:ecto]
 ]

lib/query/roots.ex

@@ -7,7 +7,7 @@ defmodule Hierarch.Query.Roots do
   Return query expressions for roots
   """
   def query(schema) do
-    condition= roots_condition(schema)
+    condition = roots_condition(schema)
 
     from schema, where: ^condition
   end