Release 0.31.0

• Upgrade log-process-errors 5.0.3 -> 6.0.0 (fd8952e)
• Upgrade keep-func-props 2.0.1 -> 3.0.0 (013fc8b)
• Upgrade normalize-node-version 6.1.2 -> 7.0.0 (20dc597)
• Upgrade got 10.0.0-alpha.2.2 -> 10.2.0 (798ef46)
• Use new got version (61b3175)
• Remove stream-to-promise (6aefa25)
• Use fs.promises (e2ce7e1)