#1210: Add rule 'rails_migrations_pending'

* Add rule 'rails_migrations_pending'

* Update thefuck/rules/rails_migrations_pending.py

Co-authored-by: Pablo Aguiar <scorphus@gmail.com>

* Add initial command to corrected command

Co-authored-by: Pablo Aguiar <scorphus@gmail.com>

thefuck/rules/rails_migrations_pending.py

@@ -0,0 +1,14 @@
+import re
+from thefuck.shells import shell
+
+
+SUGGESTION_REGEX = r"To resolve this issue, run:\s+(.*?)\n"
+
+
+def match(command):
+    return "Migrations are pending. To resolve this issue, run:" in command.output
+
+
+def get_new_command(command):
+    migration_script = re.search(SUGGESTION_REGEX, command.output).group(1)
+    return shell.and_(migration_script, command.script)