Relax requirements on printing for BigFloat

Author: oxinabox

test/rand_tangent.jl

@@ -100,7 +100,7 @@ struct Bar
             @test length(string(rand_tangent(1.0))) <= 6
             @test length(string(rand_tangent(1.0 + 1.0im))) <= 12
             @test length(string(rand_tangent(1f0))) <= 12
-            @test length(string(rand_tangent(big"1.0"))) <= 12
+            @test length(string(rand_tangent(big"1.0"))) <= 20
         end
     end
 end