update `adding-field-with-default` documentation

Changed

• differentiate between VOLATILE and non-VOLATILE defaults in adding-field-with-default documentation (#201)

PG13 parser

Fixed

• errors parsing PG12 and later query syntax by upgrading to PG13 parser (#174)
• parsing alter constraint statement (#173)

v0.8.1

Fixed

• copy pasta of rename-table into the ban-drop-column rule (#168)
• parsing an index without a name specified (#169)

v0.8.0

Fixed

• false positives with disallowed-unique-constraint and adding-serial-primary-key-field. Thanks @qoelet! (#161)

v0.7.3

Fixed

• false positives with require-concurrent-index rule (#157)

v0.7.2

Fixed

• incorrect internal schema for "alter table" statements with function calls. Thanks @qoelet! (#154)

v0.7.1

Fixed

• incorrect internal schema for "create partition" statements. (#146)
• upload-to-github command not obeying top level --excludes. (#142)

Changed

• allowing adding not null column with default for adding-not-null-field. (#144)

v0.7.0

Added

• link to website for tty reporter when there are lint errors. (#120)
• DROP INDEX support for "require-concurrent-index-creation" and "prefer-robust-stmts". (#124)
• github comment now includes Squawk's version number. (#131)
• new ban-drop-column rule (#132)

Changed

• updated "adding-not-null-field" to warn about making a column non-nullable with NOT NULL. See the "adding-not-null-field" docs for more information. (#101)

Fixed

• false positive with prefer-text-field that wasn't allowing varchar
  without a length specified

v0.6.0

Added

• added "debug" option for --dump-ast to print out tree using Rust's Debug formatter (#92)
• added new rule, "adding-foreign-key-constraint", to provide suggestions for safely adding foreign key constraints (#91)

Changed

• updated "robust-stmts" suggestions with caveat about IF NOT EXISTS (#95)
• updated "constraint-missing-not-valid" to warn about adding a constraint as NOT VALID and then using "VALIDATE CONSTRAINT" in the same transaction (#97)
• updated "prefer-robust-stmts" with exception for using DROP CONSTRAINT IF EXISTS before ADD CONSTRAINT (#99)

Fixed

• error reporting is more user friendly (#89, #90)

v0.5.4

Fixed

• parsing of RangeVar with missing inh field