Issues with skafolder_tester

[virtual-light]

When I compiling elixir_common locally I have this file

yyevhen@yyevhen:~/Projects/VBT/elixir_common$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   test/integration/skafolder_tester/mix.lock

no changes added to commit (use "git add" and/or "git commit -a")

Also when I am trying to run mix format I get this error

yyevhen@yyevhen:~/Projects/VBT/elixir_common$ mix format
mix format failed for file: test/integration/skafolder_tester/deps/credo/.template.check.ex
** (SyntaxError) test/integration/skafolder_tester/deps/credo/.template.check.ex:1: syntax error before: '='
    (elixir) lib/code.ex:553: Code.format_string!/2
    (mix) lib/mix/tasks/format.ex:418: Mix.Tasks.Format.format_file/2
    (elixir) lib/task/supervised.ex:90: Task.Supervised.invoke_mfa/2
    (elixir) lib/task/supervised.ex:35: Task.Supervised.reply/5
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3