Added missing slash. (Neargye#30)

Fixed installation to $prefix/include.

Signed-off-by: Vitaly Zaitsev <vitaly@easycoding.org>

Author: xvitaly

CMakeLists.txt

@@ -46,7 +46,7 @@ if(SEMVER_OPT_INSTALL)
             NAMESPACE ${PROJECT_NAME}::
             DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME})
 
-    install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include
+    install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/
             DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
     export(EXPORT ${PROJECT_NAME}Config