Made spdlog a proper git submodule and upgraded to the latest version.

The latest version fo spdlog does not provide the streaming interface any more,
so the macro definition of LOG and calls to it were adjusted accordingly.

1 files changed, 8 insertions, 4 deletions

diff --git a/README.md b/README.md
index c4b5fa1a..bfc121d5 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,11 @@ Requirements:
 
 Compilation with `cmake > 3.5`:
 
-    mkdir build
-    cd build
-    cmake ..
-    make -j
+```
+git submodule init
+git submodule update
+mkdir build
+cd build
+cmake ..
+make -j
+```
\ No newline at end of file