miscelanous updates

usql/Readme.md

@@ -1,7 +1,9 @@
-
 ### TODO
+- escape " in save csv
+- is null | is not null
 - coalesce, date functions now, add_date; string functions rtrim, ltrim, rpad, lpad; math function round
 - add pipe | concatenation
+- add support for 1_000_000 numbers
 
 - support for order by, offset, limit (allow column name in order by, validate)
 - support for uniqueue indexes (primary key)
@@ -9,6 +11,7 @@
 - support for joining
 - add count min and max functions, eg aggregate functions
 
+- use string_to_double and string_to_long (from Table) everywhere
 - add const wherever should be
-- PERF in Row::Row(const Row &other), could be more efficient (memory and cpu)
+- use static methods where posible
 - use references where pointer cannot be nullptr