README: Update requirements to Go 1.2

Author: julienschmidt

README.md

@@ -40,7 +40,7 @@ A MySQL-Driver for Go's [database/sql](http://golang.org/pkg/database/sql) packa
   * Optional `time.Time` parsing
 
 ## Requirements
-  * Go 1.1 or higher
+  * Go 1.2 or higher
   * MySQL (4.1+), MariaDB, Percona Server, Google CloudSQL or Sphinx (2.2.3+)
 
 ---------------------------------------