Merge pull request #48 from avshvetz/master

[+] add `BeginTx` method into `pgxIface`, closes #47

Author: pashagolub

pgxmock.go

@@ -112,6 +112,7 @@ type pgxIface interface {
 	pgxMockIface
 	Begin(context.Context) (pgx.Tx, error)
 	BeginTxFunc(ctx context.Context, txOptions pgx.TxOptions, f func(pgx.Tx) error) (err error)
+	BeginTx(ctx context.Context, txOptions pgx.TxOptions) (pgx.Tx, error)
 	Exec(context.Context, string, ...interface{}) (pgconn.CommandTag, error)
 	Query(context.Context, string, ...interface{}) (pgx.Rows, error)
 	QueryRow(context.Context, string, ...interface{}) pgx.Row