Fix "error: 'uint8_t' has not been declared"

--- a/include/indicators/termcolor.hpp
+++ b/include/indicators/termcolor.hpp
@@ -14,6 +14,7 @@
 
 #include <iostream>
 #include <cstdio>
+#include <cstdint>
 
 // Detect target's platform and set some macros in order to wrap platform
 // specific code this library depends on.