define peek(::TTYTerminal), fixes #25098 (#25161)

StefanKarpinski · web-flow · commit 5abe9b1382a3 · 2017-12-18T14:26:13.000-05:00
diff --git a/base/repl/Terminals.jl b/base/repl/Terminals.jl
@@ -170,4 +170,6 @@ end
 # use cached value of have_color
 Base.get(::TTYTerminal, k::Symbol, default) = k === :color ? Base.have_color : default
 
+Base.peek(t::TTYTerminal) = Base.peek(t.in_stream)
+
 end # module
