1.0.3

Upgrading from 1.0.2: here are no backward incompatible changes.

• #104 - fix reconnect address bug (thanks @ryanslade)
• #106 - fix backoff reconnect deadlock (thanks @ryanslade)
• #107 - fix out-of-bounds error when removing nsqlookupd addresses (thanks @andreas)
• #108 - fix potential logger race conditions (thanks @judwhite)
• #111 - fix resolved address error in reconnect loop (thanks @twmb)