TemplateHaskell utility

• Add parseConfigSpecTH functionality, now we can parse the ConfigSpec
  record at compilation time (closes #47)
• Remove bug on CLI option parser, now it will coerce numbers and
  booleans to string when specifying numbers and booleans over CLI
  and the field type is a string (closes #48)
• Improve Error Types to be more granular and descriptive
• Re-organize Spec parser functions in its own module
• Add switch input for CLI spec (closes #41)

Fix bug on printer

• Remove bug that stop configuration to be rendered when a default value was an empty array

Minor bug fix

• Improvement around unhelpful error being thrown when CLI Config Map didn't contain a value on a required (by code) field

Improve pretty printer

• Improve pretty printer for configuration values (closes #32)

Add type setting to etc/spec

BREAKING CHANGES

• Add new type field to etc/spec with support for string, number,
  bool, [string], [number] and [bool], [object]
• Remove type field in cli spec in favor of type on etc/spec
• Allow ENV vars to accept supported types (only strings were allowed) (closes #30)
• Allow CLI options to accept supported types (only strings and numbers were allowed)
• Allow spec file to have array as default values
• Return a warning and an empty config whenever configuration files contain
  entries not defined in the spec (closes #26)

v0.3.2.0

• Upgrade to rio to version 0.1.1.0

ENV meets config files

• Add new etc/files entry to the spec file which allows specifying an
  environment variable to fetch a file (issue #20)

v0.3.0.0

BREAKING CHANGES

• Bump resolver to lts-11
• Replace protolude in favor of rio
• Update parseConfigSpec to no longer attempt to parse JSON when yaml cabal
  flag is set
• Add sensitive setting to etc/spec entries
• Add Value type to deal with sensitive values
• Update examples with sensitive values
• Add optional key context to the InvalidConfiguration error (issue #12)
• Add config printer function that renders config map with/without colors (issue #15)
• Give precedence to values that do not contain inner JSON.Null values (issue #16)

IConfig typeclass for easy newtype wrapping of Config

• Move Config API to typeclass IConfig
• Add a Setup.hs file to every hachage repo (issue #5)
• Add example of a project with a config spec embedded in the binary

Allow null default values

• Add support for null values on Default (issue #3)
• If cli cabal flag is false, have parseConfigSpec return ConfigSpec () instead of ambiguous FromJSON value (issue #3)
• Bump aeson dependency to <1.3