remove 1.7.2

CMake/cotire.cmake

@@ -94,7 +94,6 @@ if (POLICY CMP0054)
 endif()
 
 set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
-set (COTIRE_CMAKE_MODULE_VERSION "1.7.2")
 set (COTIRE_CMAKE_MODULE_VERSION "1.7.3")
 
 include(CMakeParseArguments)