Clarify license

- Add link to official license text
- Use SPDX identifier for license
- Clarify that the code is GPL or later
- See issue #89

Signed-off-by: Michal Čihař <[email protected]>

Author: nijel

src/Component.php

@@ -20,7 +20,7 @@
  *
  * @category Components
  * @package  SqlParser
- * @license  http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license  https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 abstract class Component
 {

src/Components/AlterOperation.php

@@ -19,7 +19,7 @@
  * @category   Components
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class AlterOperation extends Component
 {

src/Components/Array2d.php

@@ -19,7 +19,7 @@
  * @category   Keywords
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class Array2d extends Component
 {

src/Components/ArrayObj.php

@@ -19,7 +19,7 @@
  * @category   Components
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class ArrayObj extends Component
 {

src/Components/Condition.php

@@ -19,7 +19,7 @@
  * @category   Keywords
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class Condition extends Component
 {

src/Components/CreateDefinition.php

@@ -24,7 +24,7 @@
  * @category   Components
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class CreateDefinition extends Component
 {

src/Components/DataType.php

@@ -19,7 +19,7 @@
  * @category   Components
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class DataType extends Component
 {

src/Components/Expression.php

@@ -22,7 +22,7 @@
  * @category   Components
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class Expression extends Component
 {

src/Components/ExpressionArray.php

@@ -19,7 +19,7 @@
  * @category   Keywords
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class ExpressionArray extends Component
 {

src/Components/FunctionCall.php

@@ -19,7 +19,7 @@
  * @category   Keywords
  * @package    SqlParser
  * @subpackage Components
- * @license    http://opensource.org/licenses/GPL-2.0 GNU Public License
+ * @license    https://www.gnu.org/licenses/gpl-2.0.txt GPL-2.0+
  */
 class FunctionCall extends Component
 {