Update INSTALL

INSTALL

 Header only version:
 ==================================================================
 Just copy the files to your build tree and use a C++11 compiler.
-or 
+Or use CMake:
 "
 add_executable(example_header_only example.cpp)
 target_link_libraries(example_header_only spdlog::spdlog_header_only)
@@ -9,11 +9,13 @@ target_link_libraries(example_header_only spdlog::spdlog_header_only)
 
 Compiled library version:
 ==================================================================
+CMake:
 "
 add_executable(example example.cpp)
 target_link_libraries(example spdlog::spdlog)
 "
-or copy src/spdlog.cpp to your build tree and pass the -DSPDLOG_COMPILED_LIB to the compiler.
+
+Or copy src/spdlog.cpp to your build tree and pass the -DSPDLOG_COMPILED_LIB to the compiler.
 
 Tested on:
 gcc 4.8.1 and above