Update LICENSE.txt

Thirdparty/DBoW2/LICENSE.txt

@@ -1,6 +1,6 @@
 DBoW2: bag-of-words library for C++ with generic descriptors
 
-Copyright (c) 2015 Dorian Galvez-Lopez. http://doriangalvez.com
+Copyright (c) 2015 Dorian Galvez-Lopez <http://doriangalvez.com> (Universidad de Zaragoza)
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -11,9 +11,7 @@ are met:
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
-3. The original author of the work must be notified of any 
-   redistribution of source code or in binary form.
-4. Neither the name of copyright holders nor the names of its
+3. Neither the name of copyright holders nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.