lib/json.hpp: Works with g++ 4.8 (for us)

The features we use seem to be working with g++ 4.8. See #2615

lib/json.hpp: Works with g++ 4.8 (for us)
The features we use seem to be working with g++ 4.8. See #2615
2aedcaf5 · Mikaël Salson · Mathieu Giraud · fa27ae7d · 2aedcaf5
Commit 2aedcaf5 authored Sep 08, 2017 by Mikaël Salson Committed by Mathieu Giraud Sep 14, 2017
--- a/algo/lib/json.hpp
+++ b/algo/lib/json.hpp
@@ -63,7 +63,7 @@ SOFTWARE.
        #error "unsupported Clang version - see https://github.com/nlohmann/json#supported-compilers"
    #endif
 #elif defined(__GNUC__)
-    #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40900
+    #if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) < 40800
        #error "unsupported GCC version - see https://github.com/nlohmann/json#supported-compilers"
    #endif
 #endif