update readme

CHANGELOG.md

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 CHANGELOG
 
+3.7.3
+*   NEW: added auto_increment detection, [bcosca/fatfree#1192](https://github.com/bcosca/fatfree/issues/1192), [bcosca/fatfree#1093](https://github.com/bcosca/fatfree/issues/1093), [bcosca/fatfree#1175](https://github.com/bcosca/fatfree/issues/1175), [#290](https://github.com/bcosca/fatfree-core/issues/290)
+*   added SMTP dialog error handling, [#317](https://github.com/bcosca/fatfree-core/issues/317)
+*   Fix: Check active transaction before rollback/commit (PHP8 issue)
+*   refactored increment/decrement operator to preceed variables
+*   added error output in CLI mode, [bcosca/fatfree#1185](https://github.com/bcosca/fatfree/issues/1185)
+*   Set PORT to 80 when SERVER_PORT is an empty string
+*   Fix: unescape dbname when extracting from dsn, [#316](https://github.com/bcosca/fatfree-core/issues/316)
+*   Fix: handling of PDO prepare() errors
+*   Fix: edge case in DB\SQL->schema(): PK not detected in PgSQL when the column is also a FK [bcosca/fatfree#1207](https://github.com/bcosca/fatfree/issues/1207)
+*   Fix: Escape literal hyphens in regex character classes, [bcosca/fatfree#1206](https://github.com/bcosca/fatfree/issues/1206)
+*   Fix: error highlighting
+*   Fix: pagination with order by on virtual fields
+*   Fixed a couple PHPDOC issues
+
 3.7.2 (28 May 2020)
 *   CHANGED, View->sandbox: disable escaping when rendering as text/plain, [bcosca/fatfree#654](https://github.com/bcosca/fatfree/issues/654)
 *   update HTTP protocol checks, [bcosca/fatfree#1190](https://github.com/bcosca/fatfree/issues/1190)