Update TrafficLight example in README (#29)

Author: henry11996

readme.md

@@ -122,14 +122,14 @@ class TrafficLight implements ColorSchemeInterface
 
         // Our Color Scheme
         $this->setColorizeArray(array(
-            Level::Debug => $this->ansi->color(SGR::COLOR_FG_WHITE)->get(),
-            Level::Info => $this->ansi->color(SGR::COLOR_FG_GREEN)->get(),
-            Level::Notice => $this->ansi->color(SGR::COLOR_FG_CYAN)->get(),
-            Level::Warning => $this->ansi->color(SGR::COLOR_FG_YELLOW)->get(),
-            Level::Error => $this->ansi->color(SGR::COLOR_FG_RED)->get(),
-            Level::Critical => $this->ansi->color(SGR::COLOR_FG_RED)->underline()->get(),
-            Level::Alert => $this->ansi->color([SGR::COLOR_FG_WHITE, SGR::COLOR_BG_RED_BRIGHT])->get(),
-            Level::Emergency => $this->ansi->color(SGR::COLOR_BG_RED_BRIGHT)->blink()->color(SGR::COLOR_FG_WHITE)->get(),
+            Level::Debug->value => $this->ansi->color([SGR::COLOR_FG_WHITE])->get(),
+            Level::Info->value => $this->ansi->color([SGR::COLOR_FG_GREEN])->get(),
+            Level::Notice->value => $this->ansi->color([SGR::COLOR_FG_CYAN])->get(),
+            Level::Warning->value => $this->ansi->color([SGR::COLOR_FG_YELLOW])->get(),
+            Level::Error->value => $this->ansi->color([SGR::COLOR_FG_RED])->get(),
+            Level::Critical->value => $this->ansi->color([SGR::COLOR_FG_RED])->underline()->get(),
+            Level::Alert->value => $this->ansi->color([SGR::COLOR_FG_WHITE, SGR::COLOR_BG_RED_BRIGHT])->get(),
+            Level::Emergency->value => $this->ansi->color([SGR::COLOR_BG_RED_BRIGHT])->blink()->color([SGR::COLOR_FG_WHITE])->get(),
         ));
     }
 }