Upgrate to rails 6.0.0 (#3167)

Marlon Henry Schweigert · shiftkey · commit 3dc70c8fc450 · 2019-09-10T11:08:25.000-03:00
* Upgrate to rails 6.0.0

* Simplify Rails.gitignore
diff --git a/Rails.gitignore b/Rails.gitignore
@@ -3,6 +3,7 @@ capybara-*.html
 .rspec
 /db/*.sqlite3
 /db/*.sqlite3-journal
+/db/*.sqlite3-[0-9]*
 /public/system
 /coverage/
 /spec/tmp
