Removed redundant line from license [skip ci]

Author: samdark

LICENSE.md

@@ -1,6 +1,3 @@
-The Yii framework is free software. It is released under the terms of
-the following BSD License.
-
 Copyright © 2008 by Yii Software LLC (http://www.yiisoft.com)
 All rights reserved.
 
@@ -29,4 +26,4 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
+POSSIBILITY OF SUCH DAMAGE.