Update migration setting since SQLite doesn't support ALTERing Columns

[anshulxyz]

This fixes the following error

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "ALTER": syntax error

More info here:

• https://github.com/miguelgrinberg/Flask-Migrate/issues/252
• https://alembic.sqlalchemy.org/en/latest/batch.html#batch-mode-with-autogenerate
• https://stackoverflow.com/a/32510603/3832086

[codecov[bot]]

Codecov Report

Merging #55 (fd2d3ee) into main (0e42184) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #55   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            8         8           
  Lines          249       249           
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  Hits           249       249           

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