v0.7.4

Closed issues:

• fix: echo -e should not print "-e" #510
• Wrong method signature in doc #498
• readFromPipe should be a function with no arguments #485
• TypeError: Cannot read property 'toString' of undefined #471

Merged pull requests:

• fix: echo supports -e option properly #511 (nfischer)
• refactor: replace fs.existsSync #509 (nfischer)
• refactor: readFromPipe() requires no arguments #506 (nfischer)
• chore: switch to eslint #504 (nfischer)
• feat: add overWrite option for commands #503 (nfischer)
• chore: update issue template #502 (nfischer)
• fixed head/tail readme #499 (charlesread)