Update INSTALL with 7.5.1

Author: tpaviot

INSTALL.md

@@ -22,7 +22,7 @@ can compile/use it :
 *   the python programming language (<http://www.python.org>). Python 3.x is required. Python 2
 is officially dropped since the release 7.5.0.
 
-*   OpenCascade 7.5.0 (<https://dev.opencascade.org>),
+*   OpenCascade 7.5.1 (<https://dev.opencascade.org>), direct source download at https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=94c00556ea33f3895196b30c45b1fa901ad4c377;sf=tgz
 
 *   SWIG 3.0.11 or higher (<http://www.swig.org>),