Update installing.md, `install(TARGET...` replaced by `install(TARGETS...`
install(TARGET...
replaced by install(TARGETS...
besed on
https://cmake.org/cmake/help/v3.8/command/install.html
and tested on own project
install(TARGET...
replaced by install(TARGETS...
besed on
https://cmake.org/cmake/help/v3.8/command/install.html
and tested on own project