seems not compatible with terminator v2

[yurenchen000]

those days seems not compatible with terminator 2.x

• open_in_current_term=True:
  • <=2.1.2: .feed() need bytes
  • >=2.1.3: .feed() need str
• open_in_current_term=False:
  new editor will stuck terminator window

so, I made little adjust..

PR #20

[mchelem]

Thanks for your contribution and sorry for the veeery long delay! I just merged PR #20