hledger-flow

• Exit when any external script fails - https://github.com/apauley/hledger-flow/issues/28

Some bugfixes and options that help with debugging:

• Support input files from the year 2011 - https://github.com/apauley/hledger-flow/issues/27
  Use a more specific input-file pattern, so as not to match 2011-include.journal
• Print command-line options if requested - https://github.com/apauley/hledger-flow/issues/11
• Use the channel output functions consistently to avoid concurrency issues.

• Create statically linked executables on Linux - https://github.com/apauley/hledger-flow/releases
• Add an option to disable parallel processing
• Log the exit status of shell commands.
• Upgrade to LTS 13.16 for GHC 8.6.4.

Rename hledger-makeitso to hledger-flow

• Add a version subcommand.
  Create issue #15 to change it into a --version flag later.
• Fix a minor issue where yearly include files were generated at the top-level
  of the directtory structure, even though the same content was available in the
  import directory.
  The top-level all-years.journal now just includes the years within the
  import directory.
• Upgrade to LTS 13.15 for GHC 8.6.4
• Add CircleCI and TravisCI build instructions. Switch the README.org to a
  README.md in order to better support CI status badges.