Update README.md

Update README.md

Add dec16, dec34 and int128 numeric types

Restrict type conversions

Add date/time support

Update README.md

Update README.md

Update README.md

Add blobs support

Add immediate(sql) method to connection class

Update README.md

Extend connection_params structure

Minor changes, logic error checks, comments

Update README.md

Update README.md

Update README.md

Add database info request

Update README.md

Add transaction parameters support

Change dataset_error base class to std::runtime_error

Update README.md

Refactor internals

Update README.md

Change conversion from decimal to string

update README.md

Replace numeric version constant with enum value