Add words in two License files. (#1450)

LICENSE

@@ -199,3 +199,13 @@
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
+
+   =======================================================================
+   Apache SkyWalking Subcomponents:
+
+   The Apache SkyWalking project contains subcomponents with separate copyright
+   notices and license terms. Your use of the source code for the these
+   subcomponents is subject to the terms and conditions of the following
+   licenses.
+
+   iconfont(from antd): https://github.com/ant-design/antd-init/tree/master/examples/local-iconfont   MIT

apm-dist/release-docs/LICENSE

@@ -378,6 +378,7 @@ MIT licenses
 antv/data-set	0.8.6:	https://github.com/antvis/data-set	MIT
 add-dom-event-listener  1.0.2:  https://github.com/yiminghe/add-dom-event-listener      MIT
 antd    3.2.2:  https://github.com/ant-design/ant-design        MIT
+iconfont(from antd): https://github.com/ant-design/antd-init/tree/master/examples/local-iconfont   MIT
 ant-design-pro  1.3.0:  https://github.com/ant-design/ant-design-pro    MIT     , declare license in package.json only.
 async-validator 1.8.2:  https://github.com/yiminghe/async-validator     MIT
 babel/polyfill	7.0.0-beta.42:	https://github.com/babel/babel/tree/master/packages/babel-polyfill	MIT	, declare license in package.json only.