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Add clarification in README.md

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Original file line number	Diff line number	Diff line change
`@@ -335,6 +335,15 @@ SELECT pgv_get('pack','var_int', NULL::int);`
`335`	`335`	`ERROR: unrecognized variable"var_int"`
`336`	`336`	`COMMIT;`
`337`	`337`	```
	`338`	+Also you cannot undo removing variable by`ROLLBACK`:
	`339`	+```sql
	`340`	`+SELECT pgv_set('pack','var_int',122, true);`
	`341`	`+BEGIN;`
	`342`	`+SELECT pgv_free();`
	`343`	`+ROLLBACK;`
	`344`	`+SELECT pgv_get('pack','var_int',NULL::int);`
	`345`	`+ERROR: unrecognized package"pack"`
	`346`	+```
`338`	`347`	If you created transactional variable once, you should use flag`is_transactional`
`339`	`348`	every time when you want to change variable value by functions`pgv_set()`,
`340`	`349`	`pgv_insert()` and deprecated setters (i.e.`pgv_set_int()`). If you try to

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