v0.2.11

• add sum_peer_chans to proportional strategy to consider multiple channels to the same peer (thanks @dmp1ce)
• docker: proper fallback for tls cert when TLS_CERT_PATH is empty string (fixes #75)
• allow using variables in config files (closes #39)
• improve robustness w.r.t commas and whitespace in chan/node list files (fixes #67)