Updated examples and README for 2.0

Signed-off-by: Michał Matczuk <michal@scylladb.com>

doc.go

@@ -2,9 +2,8 @@
 // Use of this source code is governed by a ALv2-style
 // license that can be found in the LICENSE file.
 
-// Package gocqlx is an idiomatic extension to gocql that provides usability
-// features. With gocqlx you can bind the query parameters from maps and
-// structs, use named query parameters (:identifier) and scan the query results
-// into structs and slices. It comes with a fluent and flexible CQL query
-// builder and a database migrations module.
+// Package gocqlx makes working with Scylla easy and error prone without sacrificing performance.
+// It’s inspired by Sqlx, a tool for working with SQL databases, but it goes beyond what Sqlx provides.
+//
+// For more details consult README.
 package gocqlx