INSTALL.md has been updated to provide current status information. (gabime#3052)

Author: KaganCanSit

INSTALL

@@ -1,24 +1,27 @@
-Header only version:
+Header Only Version
 ==================================================================
-Just copy the files to your build tree and use a C++11 compiler.
+Just copy the files to your build tree and use a C++11 compiler.  
 Or use CMake:
+``` 
   add_executable(example_header_only example.cpp)
   target_link_libraries(example_header_only spdlog::spdlog_header_only)
+```
 
-
-Compiled library version:
+Compiled Library Version
 ==================================================================
 CMake:
+```  
   add_executable(example example.cpp)
   target_link_libraries(example spdlog::spdlog)
+```
 
 Or copy files src/*.cpp to your build tree and pass the -DSPDLOG_COMPILED_LIB to the compiler.
 
-Tested on:
+Important Information for Compilation:
+==================================================================
+* If you encounter compilation errors with gcc 4.8.x, please note that gcc 4.8.x does not fully support C++11. In such cases, consider upgrading your compiler or using a different version that fully supports C++11 standards
+
+Tested on:  
 gcc 4.8.1 and above
 clang 3.5
-Visual Studio 2013
-
-
-
-
+Visual Studio 2013