Tag for release 0.6.0.

Merge pull request #89 from octo/config-value

Package config: Drop the "Value" suffix from "{Bool,Float64,String}Value".

Merge pull request #76 from octo/network-errmsg

Package network: Improve type checking error message.

Version 0.3.0.

Version 0.2.0.

Version 0.1.0.