Add to credo ignores and gitignore new file_system dependency
diff --git a/.credo.exs b/.credo.exs
index 64d281e..ba4bf14 100644
--- a/.credo.exs
+++ b/.credo.exs
@@ -30,6 +30,7 @@
           ~r"/src/jason",
           ~r"/src/hackney",
           ~r"/src/httpotion",
+          ~r"/src/file_system",
           ~r"/src/credo",
           ~r"/src/idna",
           ~r"/src/junit_formatter",
diff --git a/.gitignore b/.gitignore
index 4bc87ec..de31279 100644
--- a/.gitignore
+++ b/.gitignore
@@ -84,6 +84,7 @@
 src/thrift_protocol/
 src/triq/
 src/unicode_util_compat/
+src/file_system/
 tmp/
 
 src/couch/*.o