Handle BrokenPipeError

[danielhoherd]

Closes #80

$ cat <<EOF | termgraph | head -n 5
2021-05-30      15
2021-05-29      20
2021-05-28      21
2021-05-27      19
2021-05-26      19
2021-05-25      18
2021-05-24      18
2021-05-23      19
2021-05-22      19
EOF

2021-05-30: ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 15.00
2021-05-29: ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 20.00
2021-05-28: ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 21.00
2021-05-27: ▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇ 19.00
Exception ignored in: <colorama.ansitowin32.StreamWrapper object at 0x104ff40d0>
BrokenPipeError: [Errno 32] Broken pipe

There is an issue open for the remaining colorama error: tartley/colorama#302

[mkaz]

Thanks @danielhoherd for the contribution 👍