some renamings

Readme.md

@@ -1,13 +1,11 @@
 
 ### TODO
 - save table command
-- unify using of float and double keywords to double
-- use long data type for int
-- stoi -> stol, stof -> stod
+- move csv generation from usql(save_table) to table class
 - add exceptions
 - class members should have prefix m_
 - add pipe | token
-- add to_date a to_number functions
+- add to_date a to_string functions
 - add min and max functions, eg aggregate functions
 - add logging
 - add const wherever should be