Update graph.h

deploy/vector_search/src/graph.h

+ # MIT License
+ #
+ #Copyright (c) 2021 Mobius Authors
+ #
+ #Permission is hereby granted, free of charge, to any person obtaining a copy
+ #of this software and associated documentation files (the "Software"), to deal
+ #in the Software without restriction, including without limitation the rights
+ #to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ #copies of the Software, and to permit persons to whom the Software is
+ #furnished to do so, subject to the following conditions:
+
+ #The above copyright notice and this permission notice shall be included in all
+ #copies or substantial portions of the Software.
+
+ #THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ #IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ #FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ #AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ #LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ #OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ #SOFTWARE.
+
+#from https://github.com/sunbelbd/mobius/blob/e2d166547d61d791da8f06747a63b9cd38f02c71/graph.h
+
 #pragma once
 #include<vector>
 #include<algorithm>