typos fixed

Readme.md

@@ -1,7 +1,10 @@
 
 ### TODO
+- default double shoud have 2 decimal points (use set)
+- support for select col as ALIAS
 - date functions - now, add_date...
 - string functions rtrim, ltrim, rpad, lpad
+- round function
 - add pipe | concatenation
 - support for order by, offset, limit (allow column name in order by, validate)
 - command line interface
@@ -10,3 +13,4 @@
 - add count min and max functions, eg aggregate functions
 - add const wherever should be
 - PERF in Row::Row(const Row &other), could be more efficient (memory and cpu)
+- use references where pointer cannot be nullptr