fix(printResult): tables included colors even when outputStream did not support it

[10xLaCroixDrinker]

Fixes one of the two bugs described in #474

Before

$ node autocannon.js http://google.com/ --verbose > output.txt 2>&1

Running 10s test @ http://google.com/
10 connections


^[[90m┌─────────^[[39m^[[90m┬──────^[[39m^[[90m┬──────^[[39m^[[90m┬───────^[[39m^[[90m┬──────^[[39m^[[90m┬──────^[[39m^[[90m┬───────^[[39m^[[90m┬──────┐^[[39m
^[[90m│^[[39m^[[31m Stat    ^[[39m^[[90m│^[[39m^[[31m 2.5% ^[[39m^[[90m│^[[39m^[[31m 50%  ^[[39m^[[90m│^[[39m^[[31m 97.5% ^[[39m^[[90m│^[[39m^[[31m 99%  ^[[39m^[[90m│^[[39m^[[31m Avg  ^[[39m^[[90m│^[[39m^[[31m Stdev ^[[39m^[[90m│^[[39m^[[31m Max  ^[[39m^[[90m│^[[39m
^[[90m├─────────^[[39m^[[90m┼──────^[[39m^[[90m┼──────^[[39m^[[90m┼───────^[[39m^[[90m┼──────^[[39m^[[90m┼──────^[[39m^[[90m┼───────^[[39m^[[90m┼──────┤^[[39m
^[[90m│^[[39m Latency ^[[90m│^[[39m 0 ms ^[[90m│^[[39m 0 ms ^[[90m│^[[39m 0 ms  ^[[90m│^[[39m 0 ms ^[[90m│^[[39m 0 ms ^[[90m│^[[39m 0 ms  ^[[90m│^[[39m 0 ms ^[[90m│^[[39m
^[[90m└─────────^[[39m^[[90m┴──────^[[39m^[[90m┴──────^[[39m^[[90m┴───────^[[39m^[[90m┴──────^[[39m^[[90m┴──────^[[39m^[[90m┴───────^[[39m^[[90m┴──────┘^[[39m
^[[90m┌───────────^[[39m^[[90m┬─────^[[39m^[[90m┬──────^[[39m^[[90m┬─────^[[39m^[[90m┬───────^[[39m^[[90m┬─────^[[39m^[[90m┬───────^[[39m^[[90m┬─────┐^[[39m
^[[90m│^[[39m^[[31m Stat      ^[[39m^[[90m│^[[39m^[[31m 1%  ^[[39m^[[90m│^[[39m^[[31m 2.5% ^[[39m^[[90m│^[[39m^[[31m 50% ^[[39m^[[90m│^[[39m^[[31m 97.5% ^[[39m^[[90m│^[[39m^[[31m Avg ^[[39m^[[90m│^[[39m^[[31m Stdev ^[[39m^[[90m│^[[39m^[[31m Min ^[[39m^[[90m│^[[39m
^[[90m├───────────^[[39m^[[90m┼─────^[[39m^[[90m┼──────^[[39m^[[90m┼─────^[[39m^[[90m┼───────^[[39m^[[90m┼─────^[[39m^[[90m┼───────^[[39m^[[90m┼─────┤^[[39m
^[[90m│^[[39m Req/Sec   ^[[90m│^[[39m 0   ^[[90m│^[[39m 0    ^[[90m│^[[39m 0   ^[[90m│^[[39m 0     ^[[90m│^[[39m 0   ^[[90m│^[[39m 0     ^[[90m│^[[39m 0   ^[[90m│^[[39m
^[[90m├───────────^[[39m^[[90m┼─────^[[39m^[[90m┼──────^[[39m^[[90m┼─────^[[39m^[[90m┼───────^[[39m^[[90m┼─────^[[39m^[[90m┼───────^[[39m^[[90m┼─────┤^[[39m
^[[90m│^[[39m Bytes/Sec ^[[90m│^[[39m 0 B ^[[90m│^[[39m 0 B  ^[[90m│^[[39m 0 B ^[[90m│^[[39m 0 B   ^[[90m│^[[39m 0 B ^[[90m│^[[39m 0 B   ^[[90m│^[[39m 0 B ^[[90m│^[[39m
^[[90m└───────────^[[39m^[[90m┴─────^[[39m^[[90m┴──────^[[39m^[[90m┴─────^[[39m^[[90m┴───────^[[39m^[[90m┴─────^[[39m^[[90m┴───────^[[39m^[[90m┴─────┘^[[39m

Req/Bytes counts sampled once per second.
# of samples: 10

20 requests in 10.02s, 0 B read
10 errors (10 timeouts)

After

$ node autocannon.js http://google.com/ --verbose > output.txt 2>&1

Running 10s test @ http://google.com/
10 connections


┌─────────┬──────┬──────┬───────┬──────┬──────┬───────┬──────┐
│ Stat    │ 2.5% │ 50%  │ 97.5% │ 99%  │ Avg  │ Stdev │ Max  │
├─────────┼──────┼──────┼───────┼──────┼──────┼───────┼──────┤
│ Latency │ 0 ms │ 0 ms │ 0 ms  │ 0 ms │ 0 ms │ 0 ms  │ 0 ms │
└─────────┴──────┴──────┴───────┴──────┴──────┴───────┴──────┘
┌───────────┬─────┬──────┬─────┬───────┬─────┬───────┬─────┐
│ Stat      │ 1%  │ 2.5% │ 50% │ 97.5% │ Avg │ Stdev │ Min │
├───────────┼─────┼──────┼─────┼───────┼─────┼───────┼─────┤
│ Req/Sec   │ 0   │ 0    │ 0   │ 0     │ 0   │ 0     │ 0   │
├───────────┼─────┼──────┼─────┼───────┼─────┼───────┼─────┤
│ Bytes/Sec │ 0 B │ 0 B  │ 0 B │ 0 B   │ 0 B │ 0 B   │ 0 B │
└───────────┴─────┴──────┴─────┴───────┴─────┴───────┴─────┘

Req/Bytes counts sampled once per second.
# of samples: 10

20 requests in 10.03s, 0 B read
10 errors (10 timeouts)

[mcollina]

lgtm

[mcollina]

CI is failing

[10xLaCroixDrinker]

@mcollina CI is resolved