Handle SIGHUP

Handle SIGHUP so that the registered exit handlers are called to restore
the terminal back to its orignal state.

src/main.c

@@ -29,11 +29,15 @@
 #include "log.h"
 #include "error.h"
 #include "print.h"
+#include "signals.h"
 
 int main(int argc, char *argv[])
 {
     int status = 0;
 
+    /* Handle received signals */
+    signal_handlers_install();
+
     /* Add error exit handler */
     atexit(&error_exit);