enable color if stdout and stderr are both TTYs

Author: karan0299

base/client.jl

@@ -224,7 +224,7 @@ function exec_options(opts)
     global is_interactive = (opts.isinteractive != 0)
 
     #check if stdout is TTY and color is not set manually
-    if isa(stdout, TTY) && !color_set
+    if isa(stdout, TTY) && isa(stderr, TTY) && !color_set
         global have_color = true
     end