Add go-sql-driver imports to make it easier to run the examples

Author: Theo

README.md

@@ -32,17 +32,21 @@ See **.travis.yml** for supported **go** versions.
 Different use case, is to functionally test with a real database - [go-txdb](https://github.com/DATA-DOG/go-txdb)
 all database related actions are isolated within a single transaction so the database can remain in the same state.
 
-See implementation examples:
+    See implementation examples:
 
 - [blog API server](https://github.com/DATA-DOG/go-sqlmock/tree/master/examples/blog)
 - [the same orders example](https://github.com/DATA-DOG/go-sqlmock/tree/master/examples/orders)
 
-### Something you may want to test
+### Something you may want to test, assuming you use the [go-mysql-driver](https://github.com/go-sql-driver/mysql)
 
 ``` go
 package main
 
-import "database/sql"
+import (
+	"database/sql"
+
+	_ "github.com/go-sql-driver/mysql"
+)
 
 func recordStats(db *sql.DB, userID, productID int64) (err error) {
 	tx, err := db.Begin()

examples/basic/basic.go

@@ -1,6 +1,10 @@
 package main
 
-import "database/sql"
+import (
+	"database/sql"
+
+	_ "github.com/go-sql-driver/mysql"
+)
 
 func recordStats(db *sql.DB, userID, productID int64) (err error) {
 	tx, err := db.Begin()

examples/blog/blog.go

@@ -4,6 +4,8 @@ import (
 	"database/sql"
 	"encoding/json"
 	"net/http"
+
+	_ "github.com/go-sql-driver/mysql"
 )
 
 type api struct {

examples/orders/orders.go

@@ -6,6 +6,7 @@ import (
 	"log"
 
 	"github.com/kisielk/sqlstruct"
+	_ "github.com/go-sql-driver/mysql"
 )
 
 const ORDER_PENDING = 0