ANSI color codes showing up in rlang backtraces

[jennybc]

f <- function() g()
g <- function() h()
h <- function() rlang::abort("foo")
f()
#> Error: foo
#> Backtrace:
#> �[90m    �[39m█
#> �[90m 1. �[39m└─global::f()
#> �[90m 2. �[39m  └─global::g()
#> �[90m 3. �[39m    └─global::h()

^{Created on 2019-01-25 by the reprex package (v0.2.1)}

This is due to crayon. Probably https://github.com/r-lib/crayon/issues/80.