ab24a1229f
* remove trailing whitespace
* %i delimiters use square brackets
When I ran rubocop in my project, the following warnings popped up
```
db/migrate/20220227060245_create_versions.rb:31:8: C: [Correctable] Layout/TrailingWhitespace: Trailing whitespace detected.
#
^
db/migrate/20220227060245_create_versions.rb:33:41: C: [Correctable] Layout/TrailingWhitespace: Trailing whitespace detected.
# t.datetime :created_at, limit: 6
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
db/migrate/20220227060245_create_versions.rb:36:26: C: [Correctable] Style/PercentLiteralDelimiters: %i-literals should be delimited by [ and ].
add_index :versions, %i(item_type item_id)
^^^^^^^^^^^^^^^^^^^^^
```
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| .. | ||
| install | ||
| update_item_subtype | ||
| migration_generator.rb | ||